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Ruby on Rails application generates a 500 - Premature end of script error

Problem:

When I attempt to execute my Ruby on Rails application I receive "500- Premature end of script."

Solution:

This error generally has two potential causes:

  • The file permissions are not set to allow the dispatch.cgi to execute properly.

    Chmod the dispatch.cgi to 0755.

  • The path to Ruby is is incorrect in the dispatch.cgi file.

    The first line of the file is called the hashbang-- it sets the location of the interpreter (in this case ruby).

    Change the hashbang to the correct path to Ruby (/usr/bin/ruby).
    The first line of the dispatch.cgi file should look like this:
    #!/usr/bin/ruby

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