irb
irb(main):001:0> require "tlearn"
Traceback (most recent call last):
10: from /usr/local/bin/irb:23:in <main>' 9: from /usr/local/bin/irb:23:inload'
8: from /usr/local/share/gems/gems/irb-1.2.4/exe/irb:11:in <top (required)>' 7: from (irb):1 6: from /usr/local/share/ruby/site_ruby/rubygems/core_ext/kernel_require.rb:156:inrequire'
5: from /usr/local/share/ruby/site_ruby/rubygems/core_ext/kernel_require.rb:168:in rescue in require' 4: from /usr/local/share/ruby/site_ruby/rubygems/core_ext/kernel_require.rb:168:inrequire'
3: from /home/user/.gem/ruby/2.7.0/gems/tlearn-0.0.8/lib/tlearn.rb:22:in <top (required)>' 2: from /usr/local/share/ruby/site_ruby/rubygems/core_ext/kernel_require.rb:92:inrequire'
1: from /usr/local/share/ruby/site_ruby/rubygems/core_ext/kernel_require.rb:92:in `require'
TypeError (no implicit conversion of nil into String)
irb irb(main):001:0> require "tlearn" Traceback (most recent call last): 10: from /usr/local/bin/irb:23:in
<main>' 9: from /usr/local/bin/irb:23:in
load' 8: from /usr/local/share/gems/gems/irb-1.2.4/exe/irb:11:in<top (required)>' 7: from (irb):1 6: from /usr/local/share/ruby/site_ruby/rubygems/core_ext/kernel_require.rb:156:in
require' 5: from /usr/local/share/ruby/site_ruby/rubygems/core_ext/kernel_require.rb:168:inrescue in require' 4: from /usr/local/share/ruby/site_ruby/rubygems/core_ext/kernel_require.rb:168:in
require' 3: from /home/user/.gem/ruby/2.7.0/gems/tlearn-0.0.8/lib/tlearn.rb:22:in<top (required)>' 2: from /usr/local/share/ruby/site_ruby/rubygems/core_ext/kernel_require.rb:92:in
require' 1: from /usr/local/share/ruby/site_ruby/rubygems/core_ext/kernel_require.rb:92:in `require' TypeError (no implicit conversion of nil into String)