Using Weka on a Mac

If you receive an error message when you try to run Weka on a Mac, you may need to change your security preferences, at least temporarily, by taking the following steps:

  1. Open up System Preferences, located under the Apple menu in the top left corner.

  2. Under Security & Privacy, click the unlock icon and authenticate as an administrator.

  3. Make sure the radio button under Allow applications downloaded from: is set to Anywhere.

  4. Close System Preferences and restart Weka, which should now start without an error message.
Once you get it to work, you may return to System Preferences and restore the radio button to its previous setting. Once Weka has been successfully started, it should continue to start without error, even with the original security settings.