Why Am I Getting an 'ExecJS::RuntimeError' on Windows?

Determining the Root Cause of "ExecJS::RuntimeError" on Windows

When attempting to follow the Ruby tutorial on a Windows machine, you may encounter an "ExecJS::RuntimeError" error. This error occurs due to an issue with the ExecJS runtime and the JavaScript interpreter on your system.

Options:

1. Removing or Ignoring the Issue:
You can remove the line "//= require_tree ." from the application.js file. However, this only ignores the issue instead of resolving it.

2. Installing Node.js:
An alternative solution is to install Node.js and use it instead of the JavaScript runtime built into your system. While valid, this approach introduces additional software and sidesteps the underlying problem.

3. Fixing the Root Issue:
To address the root cause, modify the ExecJS "runtimes.rb" file:

• Find the section starting with "JScript = ExternalRuntime.new("
• Remove "//U" from the line :command => "cscript //E:jscript //Nologo //U"
• Change "UTF-16LE" to "UTF-8" in the line :encoding => 'UTF-16LE' # CScript with //U returns UTF-16LE

Result:

Restart your Rails server and refresh the page in your browser. The error should be resolved. If not, you can restore the original "runtimes.rb" file and explore alternative solutions.

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