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There could be a multitude of reasons why rake is aborting during your use of Ruby Koans. Here are some things you can check:

1. Check if you have the latest version of Ruby Koans installed. Go to the project’s GitHub page and make sure you have pulled the latest changes.

2. Check if you have the necessary dependencies installed. Make sure you have Rake, Rubygems, and Bundler installed.

3. Check if there are any issues with your Ruby version. Ruby Koans supports Ruby 1.8.7 and Ruby 1.9.2. Check that you have one of these versions installed and that it is properly configured.

4. Check your system’s environment variables. Make sure that your system’s environment variables are correctly set up. These variables can affect how Ruby and its dependencies function.

5. Look for error messages. Check the output of the command that you are running when Rake aborts. There may be an error message that can help you diagnose the issue.

If you are still having difficulties, consider reaching out to the Ruby Koans community for help or consulting the documentation for the tools you are using.