Xcode 13.1 keeps crashing. All I do is click on a file and it crashes. Some files open fine, but if I click on particular files XCode will crash %100 of the time. There is nothing special about the files, just plain swift files ~300 lines. This is making Xcode 13.1 unusable See crash log below. Details: 2019 MacBook Pro 16", Big Sur, 64GB ram Here my is a history of Xcode 13 Uninstalled Xcode 12 using Parallels uninstaller app Installed Xcode 13 Xcode crashes on opening files, tried several rounds of uninstalling & installing. Reformated HD and did fresh install of Big Sur. Installed Xcode 13 Same thing, Xcode crashes on opening files. Gave up, started using AppCode w/out any issues Uninstalled Xcode 13 using Parallels uninstaller app Installed Xcode 13.1rc Same thing, Xcode crashes opening files. Went back to AppCode Tried Xcode again (not a reinstall, just ran it again) and it worked without any crashes. Used Xcode 13.1rc without any issues for about 5 days. Suddenly Xcode started crashing when opening files. (no changes to system or code) Uninstalled Xcode 13.1rc with Parallels uninstaller Installed Xcode 13.1 Same issues, crashes consistently :( Anyone have any workarounds? Crash Log Process: Xcode [1934] Path: /Applications/Xcode.app/Contents/MacOS/Xcode Identifier: com.apple.dt.Xcode Version: 13.1 (19466) Build Info: IDEFrameworks-19466000000000000~20 (13A1030d) Code Type: X86-64 (Native) Parent Process: ??? [1] Responsible: Xcode [1934] User ID: 501 Date/Time: 2021-10-28 10:50:36.620 -0700 OS Version: macOS 11.6 (20G165) Report Version: 12 Bridge OS Version: 5.5 (18P4759a) Anonymous UUID: 0DFE01C0-3603-9A46-AC40-7F64E7D702E0 Time Awake Since Boot: 730 seconds System Integrity Protection: enabled Crashed Thread: 0 Dispatch queue: com.apple.main-thread Exception Type: EXC_BAD_INSTRUCTION (SIGILL) Exception Codes: 0x0000000000000001, 0x0000000000000000 Exception Note: EXC_CORPSE_NOTIFY Termination Signal: Illegal instruction: 4 Termination Reason: Namespace SIGNAL, Code 0x4 Terminating Process: exc handler [1934] Application Specific Information: ProductBuildVersion: 13A1030d Crashing on exception: -[__NSCFString substringWithRange:]: Range {16527, 6} out of bounds; string length 5512 Application Specific Backtrace 1: 0 CoreFoundation 0x00007fff205a71db __exceptionPreprocess + 242 1 DVTFoundation 0x0000000101ac7fdd DVTFailureHintExceptionPreprocessor + 446 2 libobjc.A.dylib 0x00007fff202e0d92 objc_exception_throw + 48 3 CoreFoundation 0x00007fff2065de0a _CFThrowFormattedException + 202 4 CoreFoundation 0x00007fff2051bce0 -[NSConstantDictionary objectForKey:] + 0 5 SourceModel 0x000000013980e854 -[SMSourceModel nameOfItem:nameRanges:scopeRange:] + 934 6 SymbolCacheSupport 0x0000000139c3096b $s18SymbolCacheSupport0A5TableC7element3for2inAC7ElementVSgSo17SMSourceModelItemC_So0iJ0CtF + 107 7 SymbolCacheSupport 0x0000000139b9dda1 ...