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When I try to open Xcode, it crashes unexpectedly and asks me to reopen. But reopening also gives me the same error. I have XCode 10.2.1 as well as XCode 11.7 installed.
Problem details and system configuration:
Process: Xcode [1607]
Path: /Applications/Xcode1.app/Contents/MacOS/Xcode
Identifier: com.apple.dt.Xcode
Version: 10.2.1 (14490.122)
Build Info: IDEFrameworks-14490122000000000~6 (10E1001)
Code Type: X86-64 (Native)
Parent Process: ??? [1]
Responsible: Xcode [1607]
User ID: 501
PlugIn Path: /Applications/Xcode1.app/Contents/Developer/usr/lib/libMainThreadChecker.dylib
PlugIn Identifier: libMainThreadChecker.dylib
PlugIn Version: ??? (64490.34)
Date/Time: 2020-11-16 21:23:39.623 -0500
OS Version: macOS 11.0.1 (20B29)
Report Version: 12
Bridge OS Version: 5.0.1 (18P2561)
Anonymous UUID: 14ACF447-0D96-DDDB-DD2C-2FE0B3DB664D
Time Awake Since Boot: 4800 seconds
System Integrity Protection: enabled
Crashed Thread: 0 Dispatch queue: com.apple.main-thread
Exception Type: EXC_BAD_ACCESS (SIGBUS)
Exception Codes: KERN_PROTECTION_FAILURE at 0x00007fff237919b9
Exception Note: EXC_CORPSE_NOTIFY
Termination Signal: Bus error: 10
Termination Reason: Namespace SIGNAL, Code 0xa
Terminating Process: exc handler [1607]
VM Regions Near 0x7fff237919b9:
__TEXT 7fff22bf8000-7fff23600000 [ 10.0M] r-x/r-x SM=COW /System/Library/Frameworks/AppKit.framework/Versions/C/AppKit
--> __TEXT 7fff23600000-7fff23800000 [ 2048K] r-x/rwx SM=COW /System/Library/Frameworks/AppKit.framework/Versions/C/AppKit
Submap 7fff23800000-7fff40000000 [456.0M] r--/rwx SM=PRV process-only VM submap
Application-Specific Information:
/Applications/Xcode1.app/Contents/Developer/usr/lib/libMainThreadChecker.dylib
ProductBuildVersion: 10E1001
739
Go to this path on both the Xcode's you have, beta and 10.3: /Xcode.app/Contents/Developer/usr/lib and copy the file from the Xcode that is working to the one that is crashing. Hello, same issue here after installing Mac OS BIG sure. You can fix this by replacing the 'libMainThreadChecker.dylib' file with the one in the working Xcode.
If you run your app and you get some build errors, that means Xcode has detected that the syntax of your code is wrong. If Xcode is complaining that a specific identifier doesn’t exist, then check that all of your opening curly braces have corresponding closing curly braces.
You can fix this by replacing the 'libMainThreadChecker.dylib' file with the one in the working Xcode. Go to this path on both the Xcode's you have, beta and 10.3: /Xcode.app/Contents/Developer/usr/lib and copy the file from the Xcode that is working to the one that is crashing.
Xcode 11 supports the new Apple Development and Apple Distribution certificate types. These certificates support building, running, and distributing apps on any Apple platform. Preexisting iOS and macOS development and distribution certificates continue to work, however, new certificates you create in Xcode 11 use the new types.
Faced the same issue on Big Sur update. Git stopped working as well. Fixed it by running following command in terminal.
defaults write com.apple.dt.Xcode DVTDisableMainThreadChecker 1
Original Answer Reference: https://developer.apple.com/forums/thread/651985?answerId=637934022#637934022
200
Faced the same issue after updating to Big Sur. Found a temporary workaround:
NOTE: If your project has "Main thread checker enabled" it may crash somewhere, so it's better to disable it.
27
This is a known issues
Currently there is one workaround for this.
You've to run the following command in the Terminal app to avoid crashes when starting Xcode:
defaults write com.apple.dt.Xcode DVTDisableMainThreadChecker 1
Now deactivate "Main Thread Checker" in your Xcode project: Edit Scheme -> Run/Test -> Diagnostics -> Uncheck Main Thread Checker.
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