xcode15.4 always crash when create new project or open exsit project
Have you tried deleting Xcode, rebooting, then reinstalling Xcode?
What about trying another version of Xcode?
Can you take a moment to open a bug report about this? Since you specify you don't receive this crash with Xcode 15.2, It would also be useful for you to try Xcode 16 beta and include whether the same crash happens with the beta version of Xcode. Once you open the bug report, please post the FB number here for our reference.
If you have any questions about filing a bug report, take a look at Bug Reporting: How and Why?