My Xcode can't compile *.xib and this is the error: 2021-06-30 13:34:42.355 ibtoold[5240:180074] [MT] DVTAssertions: Warning in /Library/Caches/com.apple.xbs/Sources/IDEInterfaceBuilder/IDEInterfaceBuilder-19115.3/InterfaceBuilderKit/Utilities/IBAbstractInterfaceBuilderPlatformToolManager.m:495 Details: Failed to attach to IBAgent-iOS with error: Error Domain=com.apple.InterfaceBuilder Code=-1 "Encountered an error communicating with IBAgent-iOS." UserInfo={NSLocalizedFailureReason=IBAgent-iOS (5309) failed to launch and exited with status 11, NSUnderlyingError=0x7fa995b726f0 {Error Domain=com.apple.InterfaceBuilder Code=-1 "Failed to launch IBAgent-iOS via CoreSimulator spawn" UserInfo={NSLocalizedDescription=Failed to launch IBAgent-iOS via CoreSimulator spawn, NSUnderlyingError=0x7fa995b63350 {Error Domain=com.apple.InterfaceBuilder Code=-1 "Failed to handshake with platform tool" UserInfo={NSLocalizedFailureReason=Failed to open connection over FIFOs with platform tool, NSLocalizedDescription=Failed to handshake with platform tool, NSUnderlyingError=0x7fa995b5e810 {Error Domain=com.apple.InterfaceBuilder Code=-1 "" UserInfo=0x7fa995b5e840 (not displayed)}}}}}, NSLocalizedRecoverySuggestion=Please check Console.app for crash reports for "IBAgent-iOS" for further information., NSLocalizedDescription=Encountered an error communicating with IBAgent-iOS.} Object:   Method:  +_THREADSAFE_launchNewToolWithLaunchContext:executionContext:toolProxyClass:proxyDelegate:failureContext:requestingMethod:error:forReason: Thread:  <NSThread: 0x7fa9e5421b60>{number = 1, name = main} Please file a bug at https://feedbackassistant.apple.com with this warning message and any useful information you can provide. 2021-06-30 13:34:42.355 ibtoold[5240:180074] [MT] IBPlatformTool: *** Failed to launch tool with description <IBCocoaTouchPlatformToolDescription: 0x7fa995b59330> System content for IBCocoaTouchFramework-EightAndLater <IBScaleFactorDeviceTypeDescription: 0x7fa995b58980> scaleFactor=2x, renderMode.identifier=(null): Encountered an error communicating with IBAgent-iOS. (Failure reason: IBAgent-iOS (5309) failed to launch and exited with status 11): Failed to launch IBAgent-iOS via CoreSimulator spawn: Failed to handshake with platform tool (Failure reason: Failed to open connection over FIFOs with platform tool): : Failed to open FIFOs for handshaking with platform tool (Failure reason: IBAgent-iOS exited before we could handshake) /* com.apple.ibtool.errors */ /Users/white/Downloads/IAPConnect_2.16.7-POC_tmn/IAPWallet/LaunchScreen.storyboard: error: Encountered an error communicating with IBAgent-iOS.   Failure Reason: IBAgent-iOS (5309) failed to launch and exited with status 11   Recovery Suggestion: Please check Console.app for crash reports for "IBAgent-iOS" for further information.   Underlying Errors:     Description: Failed to launch IBAgent-iOS via CoreSimulator spawn     Underlying Errors:       Description: Failed to handshake with platform tool       Failure Reason: Failed to open connection over FIFOs with platform tool       Underlying Errors:         Description:          Recovery Suggestion: Try restarting your computer         Underlying Errors:           Description: Failed to open FIFOs for handshaking with platform tool           Failure Reason: IBAgent-iOS exited before we could handshake macOS: 12.0 Beta (21A5268h) Xcode: 13.0 beta (13A5155e) This happened when I upgraded my macOS and Xcode to beta versions. Now they are beta2 and this error is still there. In Console.app there are many IBAgent-iOS crashes, like below: Incident Identifier: B054FA93-708C-467C-8FFC-BCE93325E057 CrashReporter Key: 0E556268-9A0A-80A5-ED93-2D187F2B194A Hardware Model: MacBookPro17,1 Process: IBAgent-iOS [5309] Path: /Users/USER/Desktop/Xcode-beta.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/Library/Xcode/Overlays/IBAgent-iOS Identifier: com.apple.dt.Xcode Version: 13.0 (19161.15) Code Type: X86-64 (Native) Role: Unspecified Parent Process: ibtoold [5240] Coalition: com.apple.dt.Xcode [2293] Responsible Process: [4617] Date/Time: 2021-06-30 13:34:42.3555 +0800 Launch Time: 2021-06-30 13:34:42.3476 +0800 OS Version: macOS 12.0 (21A5268h) Release Type: User Report Version: 104 Exception Type: EXC_BAD_ACCESS (SIGSEGV) Exception Subtype: KERN_INVALID_ADDRESS at 0x0000000000000000 Exception Codes: 0x0000000000000001, 0x0000000000000000 VM Region Info: 0 is not in any region. Bytes before following region: 4299710464 REGION TYPE START - END [ VSIZE] PRT/MAX SHRMOD REGION DETAIL UNUSED SPACE AT START ---> mapped file 100486000-10048a000 [ 16K] r-x/r-x SM=COW ...t_id=a2f74781 Exception Note: EXC_CORPSE_NOTIFY Termination Reason: SIGNAL 11 Segmentation fault: 11 Terminating Process: exc handler [5309] Triggered by Thread: 0 Application Specific Information: Thread 0 Crashed: 0 ??? 0x7ff7ffecc118 ??? 1 0x1004b5954 ??? 2 dyld 0x2004c2a32 dyld4::prepareSim(dyld4::RuntimeState&, char const*) + 890 3 dyld 0x2004c16b5 dyld4::prepare(dyld4::APIs&, dyld3::MachOAnalyzer const*) + 244 4 dyld 0x2004c14b4 start + 388 5 dyld 0x2004bc000 ??? Thread 1:: com.apple.rosetta.exceptionserver 0 ??? 0x7ff7ffeb9984 ??? 1 ??? 0x7ff7ffed1320 ??? Thread 0 crashed with X86 Thread State (64-bit): rax: 0x0000000000000000 rbx: 0x000000010850daf8 rcx: 0x0000000000000000 rdx: 0x0000000000000001 rdi: 0x0000000000000000 rsi: 0x0000000000000000 rbp: 0x0000000000000000 rsp: 0x0000000108bbd000 r8: 0x2cbd1c0c97070014 r9: 0x0000000000000000 r10: 0x0000000108bbd000 r11: 0x00000001089c6010 r12: 0x0000000000000000 r13: 0x00000001089c6060 r14: 0x0000000200530080 r15: 0x0000000000000000 rip: rfl: 0x0000000000000283 tmp0: 0x00000001004a4d98 tmp1: 0x00000001004a4090 tmp2: 0x00000002004dba13 Binary Images: 0x0 - 0xffffffffffffffff ??? () <00000000-0000-0000-0000-000000000000> ??? 0x2004bc000 - 0x200523fff dyld () <1051784a-31a4-3307-b922-6e65e511ff69> /usr/lib/dyld EOF