I wasn't sure if I should post this to the gaming subsection or here, but since this is an Xcode crash, I thought I'd try here first. I originally made this Spritekit game a few years ago on an old 2012 intel mac stuck on Catalina. When bringing the project over to Xcode 26, I first had to download Xcode 10 on the old mac, upgrade the project to swift 4, then bring it over to my newer machine to even be able to open it in Xcode 26. All that being said, I'm sure this process had some unintended consequences. I wasn't getting this crash before converting the project to swift 4 and bringing it over to Xcode 26. As you imagine, the entire Xcode crash report was massive. Near the top of the report there is I believe some crash relevant crash information, but google wasn't much help with the error codes and I don't know what to make of it: Exception Type: EXC_CRASH (SIGABRT) Exception Codes: 0x0000000000000000, 0x0000000000000000 Termination Reason: Namespace SIGNAL, Code 6, Abort trap: 6 Terminating Process: Xcode [55897] I have no idea how to tackle this problem since I can't even get in to the scene to look around, nor does Xcode have time to throw any specific scene errors. The game runs just fine, including that level. I can play through the entire thing on device or simulator with no issues, but if I click on the .sks of level 3 in Xcode, Xcode immediately crashes. Closing Xcode and trying to open the .sks in question by itself via finder also immediately causes an Xcode crash. I can open up the other levels in the finder just fine.