PyCall::LibPythonFunctionNotFound (Unable to find the required symbol in libpython: _Py_NoneStruct)

[ljoglar]

Hi! I really would love to be able to use your library for a project, but I can't seem to make it work, not even with the simplest example... Any help on what I'm missing would be great.

Thanks in advance!

Luis.

xxxxx@xxxxx:~/projects/ruby$ irb
irb(main):001:0> require 'pycall/import'
=> true
irb(main):002:0> include PyCall::Import
=> Object
irb(main):003:0> pyimport :math
Traceback (most recent call last):
       10: from /usr/bin/irb:23:in '<main>'
        9: from /usr/bin/irb:23:in 'load'
        8: from /usr/lib/ruby/gems/2.7.0/gems/irb-1.2.1/exe/irb:11:in '<top (required)>'
        7: from (irb):3
        6: from /var/lib/gems/2.7.0/gems/pycall-1.4.1/lib/pycall/import.rb:18:in 'pyimport'
        5: from /var/lib/gems/2.7.0/gems/pycall-1.4.1/lib/pycall.rb:74:in 'import_module'
        4: from /var/lib/gems/2.7.0/gems/pycall-1.4.1/lib/pycall/init.rb:16:in 'const_missing'
        3: from /var/lib/gems/2.7.0/gems/pycall-1.4.1/lib/pycall/init.rb:39:in 'init'
        2: from /usr/lib/ruby/2.7.0/rubygems/core_ext/kernel_require.rb:72:in 'require'
        1: from /usr/lib/ruby/2.7.0/rubygems/core_ext/kernel_require.rb:72:in 'require'
PyCall::LibPythonFunctionNotFound (Unable to find the required symbol in libpython: _Py_NoneStruct)

[buncis]

ah I have same error when trying to deploy to heroku

Gemfile

source 'https://rubygems.org'
git_source(:github) { |repo| "https://github.com/#{repo}.git" }

ruby '2.7.2'

gem 'rails', '~> 6.1.4'
gem 'pg', '~> 1.1'
gem 'puma', '~> 5.0'
gem 'sass-rails', '>= 6'
gem 'webpacker', '~> 5.0'
gem 'turbolinks', '~> 5'
gem 'jbuilder', '~> 2.7'
gem 'bootsnap', '>= 1.4.4', require: false
gem 'roo'
gem 'roo-xls'
gem 'rails_admin', '~> 2.2'
gem 'pandas'

group :development, :test do
  gem 'byebug', platforms: [:mri, :mingw, :x64_mingw]
end

group :development do
  gem 'web-console', '>= 4.1.0'
  gem 'rack-mini-profiler', '~> 2.0'
  gem 'listen', '~> 3.3'
  gem 'spring'
end

group :test do
  gem 'capybara', '>= 3.26'
  gem 'selenium-webdriver'
  gem 'webdrivers'
end

.ruby-version 2.7.2

runtime.txt python-3.9.1

requirements.txt

numpy==1.21.1
pandas==1.3.1
openpyxl==3.0.7

build log

       Using rails 6.1.4
       Using rails_admin 2.2.0
       Installing pycall 1.4.1 with native extensions
       Fetching numpy 0.4.0
       Installing numpy 0.4.0
       Fetching pandas 0.3.8
       Installing pandas 0.3.8
       Bundle complete! 20 Gemfile dependencies, 77 gems now installed.
       Gems in the groups 'development' and 'test' were not installed.
       Bundled gems are installed into `./vendor/bundle`
       Bundle completed (6.72s)
       Cleaning up the bundler cache.
-----> Detecting rake tasks
 !
 !     Could not detect rake tasks
 !     ensure you can run `$ bundle exec rake -P` against your app
 !     and using the production group of your Gemfile.
 !     rake aborted!
 !     PyCall::LibPythonFunctionNotFound: Unable to find the required symbol in libpython: _Py_NoneStruct
 !     /tmp/build_403b9e21/vendor/bundle/ruby/2.7.0/gems/bootsnap-1.7.5/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:23:in `require'
 !     /tmp/build_403b9e21/vendor/bundle/ruby/2.7.0/gems/bootsnap-1.7.5/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:23:in `block in require_with_bootsnap_lfi'
 !     /tmp/build_403b9e21/vendor/bundle/ruby/2.7.0/gems/bootsnap-1.7.5/lib/bootsnap/load_path_cache/loaded_features_index.rb:92:in `register'
 !     /tmp/build_403b9e21/vendor/bundle/ruby/2.7.0/gems/bootsnap-1.7.5/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:22:in `require_with_bootsnap_lfi'
 !     /tmp/build_403b9e21/vendor/bundle/ruby/2.7.0/gems/bootsnap-1.7.5/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:31:in `require'
 !     /tmp/build_403b9e21/vendor/bundle/ruby/2.7.0/gems/activesupport-6.1.4/lib/active_support/dependencies.rb:332:in `block in require'
 !     /tmp/build_403b9e21/vendor/bundle/ruby/2.7.0/gems/activesupport-6.1.4/lib/active_support/dependencies.rb:299:in `load_dependency'
 !     /tmp/build_403b9e21/vendor/bundle/ruby/2.7.0/gems/activesupport-6.1.4/lib/active_support/dependencies.rb:332:in `require'
 !     /tmp/build_403b9e21/vendor/bundle/ruby/2.7.0/gems/pycall-1.4.1/lib/pycall/init.rb:39:in `init'
 !     /tmp/build_403b9e21/vendor/bundle/ruby/2.7.0/gems/pycall-1.4.1/lib/pycall/init.rb:16:in `const_missing'
 !     /tmp/build_403b9e21/vendor/bundle/ruby/2.7.0/gems/pycall-1.4.1/lib/pycall.rb:74:in `import_module'
 !     /tmp/build_403b9e21/vendor/bundle/ruby/2.7.0/gems/numpy-0.4.0/lib/numpy.rb:4:in `<main>'
 !     /tmp/build_403b9e21/vendor/bundle/ruby/2.7.0/gems/bootsnap-1.7.5/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:23:in `require'
 !     /tmp/build_403b9e21/vendor/bundle/ruby/2.7.0/gems/bootsnap-1.7.5/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:23:in `block in require_with_bootsnap_lfi'
 !     /tmp/build_403b9e21/vendor/bundle/ruby/2.7.0/gems/bootsnap-1.7.5/lib/bootsnap/load_path_cache/loaded_features_index.rb:92:in `register'
 !     /tmp/build_403b9e21/vendor/bundle/ruby/2.7.0/gems/bootsnap-1.7.5/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:22:in `require_with_bootsnap_lfi'
 !     /tmp/build_403b9e21/vendor/bundle/ruby/2.7.0/gems/bootsnap-1.7.5/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:31:in `require'
 !     /tmp/build_403b9e21/vendor/bundle/ruby/2.7.0/gems/activesupport-6.1.4/lib/active_support/dependencies.rb:332:in `block in require'
 !     /tmp/build_403b9e21/vendor/bundle/ruby/2.7.0/gems/activesupport-6.1.4/lib/active_support/dependencies.rb:299:in `load_dependency'
 !     /tmp/build_403b9e21/vendor/bundle/ruby/2.7.0/gems/activesupport-6.1.4/lib/active_support/dependencies.rb:332:in `require'
 !     /tmp/build_403b9e21/vendor/bundle/ruby/2.7.0/gems/pandas-0.3.8/lib/pandas.rb:2:in `<main>'
 !     /tmp/build_403b9e21/vendor/bundle/ruby/2.7.0/gems/bootsnap-1.7.5/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:23:in `require'
 !     /tmp/build_403b9e21/vendor/bundle/ruby/2.7.0/gems/bootsnap-1.7.5/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:23:in `block in require_with_bootsnap_lfi'
 !     /tmp/build_403b9e21/vendor/bundle/ruby/2.7.0/gems/bootsnap-1.7.5/lib/bootsnap/load_path_cache/loaded_features_index.rb:92:in `register'
 !     /tmp/build_403b9e21/vendor/bundle/ruby/2.7.0/gems/bootsnap-1.7.5/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:22:in `require_with_bootsnap_lfi'
 !     /tmp/build_403b9e21/vendor/bundle/ruby/2.7.0/gems/bootsnap-1.7.5/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:31:in `require'
 !     /tmp/build_403b9e21/vendor/bundle/ruby/2.7.0/gems/bundler-2.2.21/lib/bundler/runtime.rb:66:in `block (2 levels) in require'
 !     /tmp/build_403b9e21/vendor/bundle/ruby/2.7.0/gems/bundler-2.2.21/lib/bundler/runtime.rb:61:in `each'
 !     /tmp/build_403b9e21/vendor/bundle/ruby/2.7.0/gems/bundler-2.2.21/lib/bundler/runtime.rb:61:in `block in require'
 !     /tmp/build_403b9e21/vendor/bundle/ruby/2.7.0/gems/bundler-2.2.21/lib/bundler/runtime.rb:50:in `each'
 !     /tmp/build_403b9e21/vendor/bundle/ruby/2.7.0/gems/bundler-2.2.21/lib/bundler/runtime.rb:50:in `require'
 !     /tmp/build_403b9e21/vendor/bundle/ruby/2.7.0/gems/bundler-2.2.21/lib/bundler.rb:174:in `require'
 !     /tmp/build_403b9e21/config/application.rb:7:in `<main>'
 !     /tmp/build_403b9e21/vendor/bundle/ruby/2.7.0/gems/bootsnap-1.7.5/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:23:in `require'
 !     /tmp/build_403b9e21/vendor/bundle/ruby/2.7.0/gems/bootsnap-1.7.5/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:23:in `block in require_with_bootsnap_lfi'
 !     /tmp/build_403b9e21/vendor/bundle/ruby/2.7.0/gems/bootsnap-1.7.5/lib/bootsnap/load_path_cache/loaded_features_index.rb:92:in `register'
 !     /tmp/build_403b9e21/vendor/bundle/ruby/2.7.0/gems/bootsnap-1.7.5/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:22:in `require_with_bootsnap_lfi'
 !     /tmp/build_403b9e21/vendor/bundle/ruby/2.7.0/gems/bootsnap-1.7.5/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:31:in `require'
 !     /tmp/build_403b9e21/vendor/bundle/ruby/2.7.0/gems/bootsnap-1.7.5/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:53:in `require_relative'
 !     /tmp/build_403b9e21/Rakefile:4:in `<main>'
 !     /tmp/build_403b9e21/vendor/bundle/ruby/2.7.0/gems/bootsnap-1.7.5/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:59:in `load'
 !     /tmp/build_403b9e21/vendor/bundle/ruby/2.7.0/gems/bootsnap-1.7.5/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:59:in `load'
 !     /tmp/build_403b9e21/vendor/bundle/ruby/2.7.0/gems/rake-13.0.6/lib/rake/rake_module.rb:29:in `load_rakefile'
 !     /tmp/build_403b9e21/vendor/bundle/ruby/2.7.0/gems/rake-13.0.6/lib/rake/application.rb:710:in `raw_load_rakefile'
 !     /tmp/build_403b9e21/vendor/bundle/ruby/2.7.0/gems/rake-13.0.6/lib/rake/application.rb:104:in `block in load_rakefile'
 !     /tmp/build_403b9e21/vendor/bundle/ruby/2.7.0/gems/rake-13.0.6/lib/rake/application.rb:186:in `standard_exception_handling'
 !     /tmp/build_403b9e21/vendor/bundle/ruby/2.7.0/gems/rake-13.0.6/lib/rake/application.rb:103:in `load_rakefile'
 !     /tmp/build_403b9e21/vendor/bundle/ruby/2.7.0/gems/rake-13.0.6/lib/rake/application.rb:82:in `block in run'
 !     /tmp/build_403b9e21/vendor/bundle/ruby/2.7.0/gems/rake-13.0.6/lib/rake/application.rb:186:in `standard_exception_handling'
 !     /tmp/build_403b9e21/vendor/bundle/ruby/2.7.0/gems/rake-13.0.6/lib/rake/application.rb:80:in `run'
 !     /tmp/build_403b9e21/bin/rake:5:in `<main>'
 !
/tmp/codon/tmp/buildpacks/50d5eddf222a9b7326028041d4e6509f915ccf2c/lib/language_pack/helpers/rake_runner.rb:106:in `load_rake_tasks!': Could not detect rake tasks (LanguagePack::Helpers::RakeRunner::CannotLoadRakefileError)
ensure you can run `$ bundle exec rake -P` against your app
and using the production group of your Gemfile.
rake aborted!
PyCall::LibPythonFunctionNotFound: Unable to find the required symbol in libpython: _Py_NoneStruct
/tmp/build_403b9e21/vendor/bundle/ruby/2.7.0/gems/bootsnap-1.7.5/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:23:in `require'
/tmp/build_403b9e21/vendor/bundle/ruby/2.7.0/gems/bootsnap-1.7.5/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:23:in `block in require_with_bootsnap_lfi'
/tmp/build_403b9e21/vendor/bundle/ruby/2.7.0/gems/bootsnap-1.7.5/lib/bootsnap/load_path_cache/loaded_features_index.rb:92:in `register'
/tmp/build_403b9e21/vendor/bundle/ruby/2.7.0/gems/bootsnap-1.7.5/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:22:in `require_with_bootsnap_lfi'
/tmp/build_403b9e21/vendor/bundle/ruby/2.7.0/gems/bootsnap-1.7.5/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:31:in `require'
/tmp/build_403b9e21/vendor/bundle/ruby/2.7.0/gems/activesupport-6.1.4/lib/active_support/dependencies.rb:332:in `block in require'
/tmp/build_403b9e21/vendor/bundle/ruby/2.7.0/gems/activesupport-6.1.4/lib/active_support/dependencies.rb:299:in `load_dependency'
/tmp/build_403b9e21/vendor/bundle/ruby/2.7.0/gems/activesupport-6.1.4/lib/active_support/dependencies.rb:332:in `require'
/tmp/build_403b9e21/vendor/bundle/ruby/2.7.0/gems/pycall-1.4.1/lib/pycall/init.rb:39:in `init'
/tmp/build_403b9e21/vendor/bundle/ruby/2.7.0/gems/pycall-1.4.1/lib/pycall/init.rb:16:in `const_missing'
/tmp/build_403b9e21/vendor/bundle/ruby/2.7.0/gems/pycall-1.4.1/lib/pycall.rb:74:in `import_module'
/tmp/build_403b9e21/vendor/bundle/ruby/2.7.0/gems/numpy-0.4.0/lib/numpy.rb:4:in `<main>'
/tmp/build_403b9e21/vendor/bundle/ruby/2.7.0/gems/bootsnap-1.7.5/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:23:in `require'
/tmp/build_403b9e21/vendor/bundle/ruby/2.7.0/gems/bootsnap-1.7.5/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:23:in `block in require_with_bootsnap_lfi'
/tmp/build_403b9e21/vendor/bundle/ruby/2.7.0/gems/bootsnap-1.7.5/lib/bootsnap/load_path_cache/loaded_features_index.rb:92:in `register'
/tmp/build_403b9e21/vendor/bundle/ruby/2.7.0/gems/bootsnap-1.7.5/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:22:in `require_with_bootsnap_lfi'
/tmp/build_403b9e21/vendor/bundle/ruby/2.7.0/gems/bootsnap-1.7.5/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:31:in `require'
/tmp/build_403b9e21/vendor/bundle/ruby/2.7.0/gems/activesupport-6.1.4/lib/active_support/dependencies.rb:332:in `block in require'
/tmp/build_403b9e21/vendor/bundle/ruby/2.7.0/gems/activesupport-6.1.4/lib/active_support/dependencies.rb:299:in `load_dependency'
/tmp/build_403b9e21/vendor/bundle/ruby/2.7.0/gems/activesupport-6.1.4/lib/active_support/dependencies.rb:332:in `require'
/tmp/build_403b9e21/vendor/bundle/ruby/2.7.0/gems/pandas-0.3.8/lib/pandas.rb:2:in `<main>'
/tmp/build_403b9e21/vendor/bundle/ruby/2.7.0/gems/bootsnap-1.7.5/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:23:in `require'
/tmp/build_403b9e21/vendor/bundle/ruby/2.7.0/gems/bootsnap-1.7.5/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:23:in `block in require_with_bootsnap_lfi'
/tmp/build_403b9e21/vendor/bundle/ruby/2.7.0/gems/bootsnap-1.7.5/lib/bootsnap/load_path_cache/loaded_features_index.rb:92:in `register'
/tmp/build_403b9e21/vendor/bundle/ruby/2.7.0/gems/bootsnap-1.7.5/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:22:in `require_with_bootsnap_lfi'
/tmp/build_403b9e21/vendor/bundle/ruby/2.7.0/gems/bootsnap-1.7.5/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:31:in `require'
/tmp/build_403b9e21/vendor/bundle/ruby/2.7.0/gems/bundler-2.2.21/lib/bundler/runtime.rb:66:in `block (2 levels) in require'
/tmp/build_403b9e21/vendor/bundle/ruby/2.7.0/gems/bundler-2.2.21/lib/bundler/runtime.rb:61:in `each'
/tmp/build_403b9e21/vendor/bundle/ruby/2.7.0/gems/bundler-2.2.21/lib/bundler/runtime.rb:61:in `block in require'
/tmp/build_403b9e21/vendor/bundle/ruby/2.7.0/gems/bundler-2.2.21/lib/bundler/runtime.rb:50:in `each'
/tmp/build_403b9e21/vendor/bundle/ruby/2.7.0/gems/bundler-2.2.21/lib/bundler/runtime.rb:50:in `require'
/tmp/build_403b9e21/vendor/bundle/ruby/2.7.0/gems/bundler-2.2.21/lib/bundler.rb:174:in `require'
/tmp/build_403b9e21/config/application.rb:7:in `<main>'
/tmp/build_403b9e21/vendor/bundle/ruby/2.7.0/gems/bootsnap-1.7.5/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:23:in `require'
/tmp/build_403b9e21/vendor/bundle/ruby/2.7.0/gems/bootsnap-1.7.5/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:23:in `block in require_with_bootsnap_lfi'
/tmp/build_403b9e21/vendor/bundle/ruby/2.7.0/gems/bootsnap-1.7.5/lib/bootsnap/load_path_cache/loaded_features_index.rb:92:in `register'
/tmp/build_403b9e21/vendor/bundle/ruby/2.7.0/gems/bootsnap-1.7.5/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:22:in `require_with_bootsnap_lfi'
/tmp/build_403b9e21/vendor/bundle/ruby/2.7.0/gems/bootsnap-1.7.5/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:31:in `require'
/tmp/build_403b9e21/vendor/bundle/ruby/2.7.0/gems/bootsnap-1.7.5/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:53:in `require_relative'
/tmp/build_403b9e21/Rakefile:4:in `<main>'
/tmp/build_403b9e21/vendor/bundle/ruby/2.7.0/gems/bootsnap-1.7.5/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:59:in `load'
/tmp/build_403b9e21/vendor/bundle/ruby/2.7.0/gems/bootsnap-1.7.5/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:59:in `load'
/tmp/build_403b9e21/vendor/bundle/ruby/2.7.0/gems/rake-13.0.6/lib/rake/rake_module.rb:29:in `load_rakefile'
/tmp/build_403b9e21/vendor/bundle/ruby/2.7.0/gems/rake-13.0.6/lib/rake/application.rb:710:in `raw_load_rakefile'
/tmp/build_403b9e21/vendor/bundle/ruby/2.7.0/gems/rake-13.0.6/lib/rake/application.rb:104:in `block in load_rakefile'
/tmp/build_403b9e21/vendor/bundle/ruby/2.7.0/gems/rake-13.0.6/lib/rake/application.rb:186:in `standard_exception_handling'
/tmp/build_403b9e21/vendor/bundle/ruby/2.7.0/gems/rake-13.0.6/lib/rake/application.rb:103:in `load_rakefile'
/tmp/build_403b9e21/vendor/bundle/ruby/2.7.0/gems/rake-13.0.6/lib/rake/application.rb:82:in `block in run'
/tmp/build_403b9e21/vendor/bundle/ruby/2.7.0/gems/rake-13.0.6/lib/rake/application.rb:186:in `standard_exception_handling'
/tmp/build_403b9e21/vendor/bundle/ruby/2.7.0/gems/rake-13.0.6/lib/rake/application.rb:80:in `run'
/tmp/build_403b9e21/bin/rake:5:in `<main>'
    from /tmp/codon/tmp/buildpacks/50d5eddf222a9b7326028041d4e6509f915ccf2c/lib/language_pack/ruby.rb:1007:in `rake'
    from /tmp/codon/tmp/buildpacks/50d5eddf222a9b7326028041d4e6509f915ccf2c/lib/language_pack/rails4.rb:78:in `block (2 levels) in run_assets_precompile_rake_task'
    from /tmp/codon/tmp/buildpacks/50d5eddf222a9b7326028041d4e6509f915ccf2c/lib/language_pack/base.rb:190:in `log'
    from /tmp/codon/tmp/buildpacks/50d5eddf222a9b7326028041d4e6509f915ccf2c/lib/language_pack/rails4.rb:72:in `block in run_assets_precompile_rake_task'
    from /tmp/codon/tmp/buildpacks/50d5eddf222a9b7326028041d4e6509f915ccf2c/lib/language_pack/instrument.rb:18:in `block (2 levels) in instrument'
    from /tmp/codon/tmp/buildpacks/50d5eddf222a9b7326028041d4e6509f915ccf2c/lib/language_pack/instrument.rb:40:in `yield_with_block_depth'
    from /tmp/codon/tmp/buildpacks/50d5eddf222a9b7326028041d4e6509f915ccf2c/lib/language_pack/instrument.rb:17:in `block in instrument'
    from /tmp/codon/tmp/buildpacks/50d5eddf222a9b7326028041d4e6509f915ccf2c/vendor/ruby/heroku-20/lib/ruby/2.6.0/benchmark.rb:308:in `realtime'
    from /tmp/codon/tmp/buildpacks/50d5eddf222a9b7326028041d4e6509f915ccf2c/lib/language_pack/instrument.rb:16:in `instrument'
    from /tmp/codon/tmp/buildpacks/50d5eddf222a9b7326028041d4e6509f915ccf2c/lib/language_pack/base.rb:50:in `instrument'
    from /tmp/codon/tmp/buildpacks/50d5eddf222a9b7326028041d4e6509f915ccf2c/lib/language_pack/base.rb:46:in `instrument'
    from /tmp/codon/tmp/buildpacks/50d5eddf222a9b7326028041d4e6509f915ccf2c/lib/language_pack/rails4.rb:71:in `run_assets_precompile_rake_task'
    from /tmp/codon/tmp/buildpacks/50d5eddf222a9b7326028041d4e6509f915ccf2c/lib/language_pack/ruby.rb:112:in `block (2 levels) in compile'
    from /tmp/codon/tmp/buildpacks/50d5eddf222a9b7326028041d4e6509f915ccf2c/lib/language_pack/ruby.rb:1028:in `allow_git'
    from /tmp/codon/tmp/buildpacks/50d5eddf222a9b7326028041d4e6509f915ccf2c/lib/language_pack/ruby.rb:105:in `block in compile'
    from /tmp/codon/tmp/buildpacks/50d5eddf222a9b7326028041d4e6509f915ccf2c/lib/language_pack/instrument.rb:18:in `block (2 levels) in instrument'
    from /tmp/codon/tmp/buildpacks/50d5eddf222a9b7326028041d4e6509f915ccf2c/lib/language_pack/instrument.rb:40:in `yield_with_block_depth'
    from /tmp/codon/tmp/buildpacks/50d5eddf222a9b7326028041d4e6509f915ccf2c/lib/language_pack/instrument.rb:17:in `block in instrument'
    from /tmp/codon/tmp/buildpacks/50d5eddf222a9b7326028041d4e6509f915ccf2c/vendor/ruby/heroku-20/lib/ruby/2.6.0/benchmark.rb:308:in `realtime'
    from /tmp/codon/tmp/buildpacks/50d5eddf222a9b7326028041d4e6509f915ccf2c/lib/language_pack/instrument.rb:16:in `instrument'
    from /tmp/codon/tmp/buildpacks/50d5eddf222a9b7326028041d4e6509f915ccf2c/lib/language_pack/base.rb:50:in `instrument'
    from /tmp/codon/tmp/buildpacks/50d5eddf222a9b7326028041d4e6509f915ccf2c/lib/language_pack/base.rb:46:in `instrument'
    from /tmp/codon/tmp/buildpacks/50d5eddf222a9b7326028041d4e6509f915ccf2c/lib/language_pack/ruby.rb:91:in `compile'
    from /tmp/codon/tmp/buildpacks/50d5eddf222a9b7326028041d4e6509f915ccf2c/lib/language_pack/rails2.rb:62:in `block in compile'
    from /tmp/codon/tmp/buildpacks/50d5eddf222a9b7326028041d4e6509f915ccf2c/lib/language_pack/instrument.rb:18:in `block (2 levels) in instrument'
    from /tmp/codon/tmp/buildpacks/50d5eddf222a9b7326028041d4e6509f915ccf2c/lib/language_pack/instrument.rb:40:in `yield_with_block_depth'
    from /tmp/codon/tmp/buildpacks/50d5eddf222a9b7326028041d4e6509f915ccf2c/lib/language_pack/instrument.rb:17:in `block in instrument'
    from /tmp/codon/tmp/buildpacks/50d5eddf222a9b7326028041d4e6509f915ccf2c/vendor/ruby/heroku-20/lib/ruby/2.6.0/benchmark.rb:308:in `realtime'
    from /tmp/codon/tmp/buildpacks/50d5eddf222a9b7326028041d4e6509f915ccf2c/lib/language_pack/instrument.rb:16:in `instrument'
    from /tmp/codon/tmp/buildpacks/50d5eddf222a9b7326028041d4e6509f915ccf2c/lib/language_pack/base.rb:50:in `instrument'
    from /tmp/codon/tmp/buildpacks/50d5eddf222a9b7326028041d4e6509f915ccf2c/lib/language_pack/base.rb:46:in `instrument'
    from /tmp/codon/tmp/buildpacks/50d5eddf222a9b7326028041d4e6509f915ccf2c/lib/language_pack/rails2.rb:60:in `compile'
    from /tmp/codon/tmp/buildpacks/50d5eddf222a9b7326028041d4e6509f915ccf2c/lib/language_pack/rails3.rb:42:in `block in compile'
    from /tmp/codon/tmp/buildpacks/50d5eddf222a9b7326028041d4e6509f915ccf2c/lib/language_pack/instrument.rb:18:in `block (2 levels) in instrument'
    from /tmp/codon/tmp/buildpacks/50d5eddf222a9b7326028041d4e6509f915ccf2c/lib/language_pack/instrument.rb:40:in `yield_with_block_depth'
    from /tmp/codon/tmp/buildpacks/50d5eddf222a9b7326028041d4e6509f915ccf2c/lib/language_pack/instrument.rb:17:in `block in instrument'
    from /tmp/codon/tmp/buildpacks/50d5eddf222a9b7326028041d4e6509f915ccf2c/vendor/ruby/heroku-20/lib/ruby/2.6.0/benchmark.rb:308:in `realtime'
    from /tmp/codon/tmp/buildpacks/50d5eddf222a9b7326028041d4e6509f915ccf2c/lib/language_pack/instrument.rb:16:in `instrument'
    from /tmp/codon/tmp/buildpacks/50d5eddf222a9b7326028041d4e6509f915ccf2c/lib/language_pack/base.rb:50:in `instrument'
    from /tmp/codon/tmp/buildpacks/50d5eddf222a9b7326028041d4e6509f915ccf2c/lib/language_pack/base.rb:46:in `instrument'
    from /tmp/codon/tmp/buildpacks/50d5eddf222a9b7326028041d4e6509f915ccf2c/lib/language_pack/rails3.rb:41:in `compile'
    from /tmp/codon/tmp/buildpacks/50d5eddf222a9b7326028041d4e6509f915ccf2c/lib/language_pack/rails4.rb:35:in `block in compile'
    from /tmp/codon/tmp/buildpacks/50d5eddf222a9b7326028041d4e6509f915ccf2c/lib/language_pack/instrument.rb:18:in `block (2 levels) in instrument'
    from /tmp/codon/tmp/buildpacks/50d5eddf222a9b7326028041d4e6509f915ccf2c/lib/language_pack/instrument.rb:40:in `yield_with_block_depth'
    from /tmp/codon/tmp/buildpacks/50d5eddf222a9b7326028041d4e6509f915ccf2c/lib/language_pack/instrument.rb:17:in `block in instrument'
    from /tmp/codon/tmp/buildpacks/50d5eddf222a9b7326028041d4e6509f915ccf2c/vendor/ruby/heroku-20/lib/ruby/2.6.0/benchmark.rb:308:in `realtime'
    from /tmp/codon/tmp/buildpacks/50d5eddf222a9b7326028041d4e6509f915ccf2c/lib/language_pack/instrument.rb:16:in `instrument'
    from /tmp/codon/tmp/buildpacks/50d5eddf222a9b7326028041d4e6509f915ccf2c/lib/language_pack/base.rb:50:in `instrument'
    from /tmp/codon/tmp/buildpacks/50d5eddf222a9b7326028041d4e6509f915ccf2c/lib/language_pack/base.rb:46:in `instrument'
    from /tmp/codon/tmp/buildpacks/50d5eddf222a9b7326028041d4e6509f915ccf2c/lib/language_pack/rails4.rb:34:in `compile'
    from /tmp/codon/tmp/buildpacks/50d5eddf222a9b7326028041d4e6509f915ccf2c/lib/language_pack/rails6.rb:20:in `block in compile'
    from /tmp/codon/tmp/buildpacks/50d5eddf222a9b7326028041d4e6509f915ccf2c/lib/language_pack/instrument.rb:18:in `block (2 levels) in instrument'
    from /tmp/codon/tmp/buildpacks/50d5eddf222a9b7326028041d4e6509f915ccf2c/lib/language_pack/instrument.rb:40:in `yield_with_block_depth'
    from /tmp/codon/tmp/buildpacks/50d5eddf222a9b7326028041d4e6509f915ccf2c/lib/language_pack/instrument.rb:17:in `block in instrument'
    from /tmp/codon/tmp/buildpacks/50d5eddf222a9b7326028041d4e6509f915ccf2c/vendor/ruby/heroku-20/lib/ruby/2.6.0/benchmark.rb:308:in `realtime'
    from /tmp/codon/tmp/buildpacks/50d5eddf222a9b7326028041d4e6509f915ccf2c/lib/language_pack/instrument.rb:16:in `instrument'
    from /tmp/codon/tmp/buildpacks/50d5eddf222a9b7326028041d4e6509f915ccf2c/lib/language_pack/base.rb:50:in `instrument'
    from /tmp/codon/tmp/buildpacks/50d5eddf222a9b7326028041d4e6509f915ccf2c/lib/language_pack/base.rb:46:in `instrument'
    from /tmp/codon/tmp/buildpacks/50d5eddf222a9b7326028041d4e6509f915ccf2c/lib/language_pack/rails6.rb:18:in `compile'
    from /tmp/codon/tmp/buildpacks/50d5eddf222a9b7326028041d4e6509f915ccf2c/bin/support/ruby_compile:20:in `block (2 levels) in <main>'
    from /tmp/codon/tmp/buildpacks/50d5eddf222a9b7326028041d4e6509f915ccf2c/lib/language_pack/base.rb:190:in `log'
    from /tmp/codon/tmp/buildpacks/50d5eddf222a9b7326028041d4e6509f915ccf2c/bin/support/ruby_compile:19:in `block in <main>'
    from /tmp/codon/tmp/buildpacks/50d5eddf222a9b7326028041d4e6509f915ccf2c/lib/language_pack/instrument.rb:35:in `block in trace'
    from /tmp/codon/tmp/buildpacks/50d5eddf222a9b7326028041d4e6509f915ccf2c/lib/language_pack/instrument.rb:18:in `block (2 levels) in instrument'
    from /tmp/codon/tmp/buildpacks/50d5eddf222a9b7326028041d4e6509f915ccf2c/lib/language_pack/instrument.rb:40:in `yield_with_block_depth'
    from /tmp/codon/tmp/buildpacks/50d5eddf222a9b7326028041d4e6509f915ccf2c/lib/language_pack/instrument.rb:17:in `block in instrument'
    from /tmp/codon/tmp/buildpacks/50d5eddf222a9b7326028041d4e6509f915ccf2c/vendor/ruby/heroku-20/lib/ruby/2.6.0/benchmark.rb:308:in `realtime'
    from /tmp/codon/tmp/buildpacks/50d5eddf222a9b7326028041d4e6509f915ccf2c/lib/language_pack/instrument.rb:16:in `instrument'
    from /tmp/codon/tmp/buildpacks/50d5eddf222a9b7326028041d4e6509f915ccf2c/lib/language_pack/instrument.rb:35:in `trace'
    from /tmp/codon/tmp/buildpacks/50d5eddf222a9b7326028041d4e6509f915ccf2c/bin/support/ruby_compile:15:in `<main>'
 !     Push rejected, failed to compile Ruby app.
 !     Push failed

I will try with earlier version

[buncis]

sorry if its not answering the original question

but since its have save error message

I manage to fix my problem in heroku by using heroku-18 stack

this buildpacks https://github.com/ReforgeHQ/heroku-buildpack-python with python 3.8.1

I also manage to fix this problem using heroku-20 stack and python 3.8.10 in here #151

[buncis]

@ljoglar make sure your python have --enable-shared to check it first run this on your bash/terminal python3 -msysconfig | grep enable-shared

if there is no result that show --enable-shared on your python

you need to recompile ur python with --enable-shared

[bcdavasconcelos]

@buncis, could you detail how you managed to recompile your py interpreter with --enable-shared? I spent many hours trying to do so in my M1 mac but failed miserably.

[buncis]

@bcdavasconcelos I explain my solution on #151