I've had a couple of users reports this and wanted to get an issue posted to help others find the solution more quickly.
If you store your IDE projects in the
Documents folder on Mac OS X and upgrade to Catalina, you may find that the projects no longer work properly. This is because the Catalina upgrade changes some of the directory structures and the IDE project is pointing at a stale filesystem location.
Here's one recommendation for fixing the issue:
A quick Google search of "catalina documents folder" may yield other options.