Can't run in simulator

Happy New Year.

New M-series Mac.

When I try to run one of my apps in the simulator I get this:

An error occurred when attempting to launch the application. You may need to delete the application from the simulator if it already exists or check the Minimum iOS version.

Things work find on old Mac. Same version of Xojo.

Other apps do run in simulator.

Anyone have any ideas?

First make sure your project folder isn’t on your iCloud Drive or Dropbox or something like that. The locking while the file is uploaded causes all kinds of issues.

Also, make sure you’re using the latest version of Xcode and have the latest simulators installed.