What was the error? Saying you got an error, then not actually telling us what the error is, is not particularly useful.
Is that version of the app actually compatible with the new macOS beta? You should get in touch with the MySQL developers to see if there's an issue. It's generally not Apple's fault that a third-party app that hasn't been written for a version of macOS doesn't work.
Topic:
Developer Tools & Services
SubTopic:
Apple Developer Program