~/.gem/gems/smt_rails-0.2.9/lib/smt_rails/engine.rb:9:in `block (2 levels) in <class:Engine>': undefined method `register_engine' for #<Sprockets::Environment:0x00000004f20130> (NoMethodError)
Did you mean? register_pipeline
from /home/fred/.gem/gems/sprockets-rails-3.2.0/lib/sprockets/railtie.rb:179:in `block in build_environment'
from /home/fred/.gem/gems/sprockets-rails-3.2.0/lib/sprockets/railtie.rb:178:in `each'
from /home/fred/.gem/gems/sprockets-rails-3.2.0/lib/sprockets/railtie.rb:178:in `build_environment'