After upgrading to the beta OS, Macos Catalina, I cant seem to open any projects in my Xcode (both Beta and nonbeta versions). Having said that, after some investigation (https://stackoverflow.com/questions/57019534/i-cant-open-xcode-project-after-updating-to-catalina) it seems that I can open projects that are in my download folder. However, the Stackoverflow answer stated that deleting the derived data should solve the problem however I have not seen that solve my problem.
Did you reboot the Mac ?
That solve many issues.
I have tried restarting my mac but that did not help me.
I cant seem to open any projects in my Xcode
Which versions of XCode exactly ?
Have you several versions of XCode with the name XCode (that could create confusion, betas should have a different name)
Do you see the project when you ask open ?
Or is it only with Open Recent command ?
What happens when you double click on xcodeproj file ?
How much memory available (disk and RAM) ?
Do you get any error message ?
Hey! I encontered with the same issue, and I also tried the above mentioned stack overflow solution without any success. What did worked for me is remove my Github account from Xcode.
Maybe not every step is neccessary, but these worked for me.
About the problem that xcode can't open the project after upgrading the system:
I found a solution, my system is 10.15 Beta, catalina, after reading the comments above and stackoverflow answers, I tried to solve my problem, but failed.
Later, I tried to change the path of the project. I found that xcode can be opened as long as the project is not on the desktop or document. I hope I can help you.
The issue seems to be with projects that are in directories that syncs to your iCloud. You should create a directory in your home directory called Developer and save your projects there. Do not save projects in any directory that syncs to iCloud. that sync processor can cause issues with Xcode.