Why Am I Getting an ExecJS::RuntimeError on Windows When Following the Ruby on Rails Tutorial?

ExecJS RuntimeError on Windows While Following Ruby Tutorial

Problem:

You encounter the "ExecJS::RuntimeError" when following the Ruby on Rails tutorial on a Windows machine. The error occurs when including the line "= require_tree ." in the "application.js" file.

Solution:

To resolve the issue, several options are available:

1. Remove "= require_tree ." and Ignore the Problem:

   • Removes the line causing the issue, but leaves the underlying problem with ExecJS unresolved.

2. Install Node.js:

   • Installs Node.js to use as the JavaScript runtime instead of the default one on your system. This avoids the issue, but requires additional software.

3. Fix the Underlying Problem:

   • Modify ExecJS's "runtimes.rb" file to update settings related to the JScript runtime on Windows.
   • Specifically, remove "//U" from the command line and change "UTF-16LE" to "UTF-8" in the encoding section.

Detailed Steps for Option 3:

1. Locate ExecJS's "runtimes.rb" file on your system.
2. Make a backup copy of the file for safety.
3. Open the original "runtimes.rb" file for editing.
4. Find the section starting with "JScript = ExternalRuntime.new(".
5. In the line containing ":command => "cscript //E:jscript //Nologo //U"", remove "//U" only.
6. In the line containing ":encoding => 'UTF-16LE' # CScript with //U returns UTF-16LE", change "UTF-16LE" to "UTF-8".
7. Save the changes to the file.
8. Restart your Rails server and refresh the page in your browser.

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