It crashes on my machine with the same report. It is due to a failing to load an ideplugin. I use a custom .xclangspec. After installing the latest DVTPlugInCompatibilityUUID Xcode started to crash. The ID for Xcode 15.0 is EB1EF21B-E756-4D3D-A6EA-E9C57D8C1924. After disabling this UUID in the Info.plist Xcode runs normally (found in the .plugin/Contents bundle. As a result I am not able to use my custom syntax colouring with Xcode 15.0.