Could not find a JavaScript runtime
My Rails3.1 app worked fine on Windows but got the "Could not find JavaScript runtime" error when running on Linux.Solution:
gem 'therubyracer', :platforms => :ruby The trick is knowing that :platforms => :ruby actually means only use this gem with "C Ruby(MRI) or Rubinius, but NOT Windows."
Windows has a builtin JavaScript engine which execjs can locate. On Linux there is not a builtin although there are plenty available to be installed. therubyracer is one of them.
Also, this problem could be resloved by installing nodejs
sudo apt-get install nodejs
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