Hi, i have met error below when i tried to po one attributes of an instance in my Xcode lldb: error: type for self cannot be reconstructed: type for typename "$xxxxx" was not found (cached) error: Couldn't realize Swift AST type of self. Hint: using `v` to directly inspect variables and fields may still work. Is there anybody met the same error before? I urgently want to know why this happen and how to fix this issue. My macOS Version is Sequoia v15.0.1, Xcode16.0. This problem showed after i upgraded my macOS and Xcode version.

Created a new project in Xcode 16.3. While adding breakpoints app is crashing every time in Xcode and playground both. Tried with swift 5 and swift 6 getting same error. Crash reason : Couldn't find the Objective-C runtime library in loaded images. Message from debugger: The LLDB RPC server has crashed. You may need to manually terminate your process lldb-rpc-server-2025-04-14-092736.txt

When I try to look at any variable in the debugger, I get a bunch of errors complaining about inability to find a file in a location that should not exist on my machine... I just upgraded form xCode 15.2, which worked fine, but now I basically cannot debug. Who is this liangchenying? It's almost like the new version was shipped with some developer's paths hard-coded in the configuration. (lldb) po [tableNumberTxt.text integerValue] warning: (arm64) /Users/stevedavison/lineskip_dev/POS/SNBC/POSSDKForIOSLIB.a(PortIO.o) 0x00000000000004a7: unable to locate module needed for external types: /Users/liangchenying/Library/Developer/Xcode/DerivedData/POSSDKForIOSLIB-bmkvfovoxsbzudehquaovgmnnooe/Build/Intermediates/PrecompiledHeaders/POSSDKForIOSLIB-Prefix-cfcbmooemqunxmehfbebereyakbw/POSSDKForIOSLIB-Prefix.pch.pch error: '/Users/liangchenying/Library/Developer/Xcode/DerivedData/POSSDKForIOSLIB-bmkvfovoxsbzudehquaovgmnnooe/Build/Intermediates/PrecompiledHeaders/POSSDKForIOSLIB-Prefix-cfcbmooemqunxmehfbebereyakbw/POSSDKForIOSLIB-Prefix.pch.pch' does not exist Debugging will be degraded due to missing types. Rebuilding the project will regenerate the needed module files.warning: (arm64) /Users/stevedavison/lineskip_dev/POS/SNBC/POSSDKForIOSLIB.a(WIFIPort.o) 0x000000000000171c: unable to locate module needed for external types: /Users/liangchenying/Library/Developer/Xcode/DerivedData/POSSDKForIOSLIB-bmkvfovoxsbzudehquaovgmnnooe/Build/Intermediates/PrecompiledHeaders/POSSDKForIOSLIB-Prefix-cfcbmooemqunxmehfbebereyakbw/POSSDKForIOSLIB-Prefix.pch.pch error: '/Users/liangchenying/Library/Developer/Xcode/DerivedData/POSSDKForIOSLIB-bmkvfovoxsbzudehquaovgmnnooe/Build/Intermediates/PrecompiledHeaders/POSSDKForIOSLIB-Prefix-cfcbmooemqunxmehfbebereyakbw/POSSDKForIOSLIB-Prefix.pch.pch' does not exist Debugging will be degraded due to missing types. Rebuilding the project will regenerate the needed module files.warning: (arm64) /Users/stevedavison/lineskip_dev/POS/SNBC/POSSDKForIOSLIB.a(SimpleLogger.o) 0x00000000000009b9: unable to locate module needed for external types: /Users/liangchenying/Library/Developer/Xcode/DerivedData/POSSDKForIOSLIB-bmkvfovoxsbzudehquaovgmnnooe/Build/Intermediates/PrecompiledHeaders/POSSDKForIOSLIB-Prefix-cfcbmooemqunxmehfbebereyakbw/POSSDKForIOSLIB-Prefix.pch.pch error: '/Users/liangchenying/Library/Developer/Xcode/DerivedData/POSSDKForIOSLIB-bmkvfovoxsbzudehquaovgmnnooe/Build/Intermediates/PrecompiledHeaders/POSSDKForIOSLIB-Prefix-cfcbmooemqunxmehfbebereyakbw/POSSDKForIOSLIB-Prefix.pch.pch' does not exist Debugging will be degraded due to missing types. Rebuilding the project will regenerate the needed module files.warning: (arm64) /Users/stevedavison/lineskip_dev/POS/SNBC/POSSDKForIOSLIB.a(POSCommand.o) 0x00000000000035bd: unable to locate module needed for external types: /Users/liangchenying/Library/Developer/Xcode/DerivedData/POSSDKForIOSLIB-bmkvfovoxsbzudehquaovgmnnooe/Build/Intermediates/PrecompiledHeaders/POSSDKForIOSLIB-Prefix-cfcbmooemqunxmehfbebereyakbw/POSSDKForIOSLIB-Prefix.pch.pch error: '/Users/liangchenying/Library/Developer/Xcode/DerivedData/POSSDKForIOSLIB-bmkvfovoxsbzudehquaovgmnnooe/Build/Intermediates/PrecompiledHeaders/POSSDKForIOSLIB-Prefix-cfcbmooemqunxmehfbebereyakbw/POSSDKForIOSLIB-Prefix.pch.pch' does not exist Debugging will be degraded due to missing types. Rebuilding the project will regenerate the needed module files.warning: (arm64) /Users/stevedavison/lineskip_dev/POS/SNBC/POSSDKForIOSLIB.a(WIFIPortToFile.o) 0x00000000000004da: unable to locate module needed for external types: /Users/liangchenying/Library/Developer/Xcode/DerivedData/POSSDKForIOSLIB-bmkvfovoxsbzudehquaovgmnnooe/Build/Intermediates/PrecompiledHeaders/POSSDKForIOSLIB-Prefix-cfcbmooemqunxmehfbebereyakbw/POSSDKForIOSLIB-Prefix.pch.pch error: '/Users/liangchenying/Library/Developer/Xcode/DerivedData/POSSDKForIOSLIB-bmkvfovoxsbzudehquaovgmnnooe/Build/Intermediates/PrecompiledHeaders/POSSDKForIOSLIB-Prefix-cfcbmooemqunxmehfbebereyakbw/POSSDKForIOSLIB-Prefix.pch.pch' does not exist Debugging will be degraded due to missing types. Rebuilding the project will regenerate the needed module files.warning: (arm64) /Users/stevedavison/lineskip_dev/POS/SNBC/POSSDKForIOSLIB.a(POSSDK.o) 0x0000000000002432: unable to locate module needed for external types: /Users/liangchenying/Library/Developer/Xcode/DerivedData/POSSDKForIOSLIB-bmkvfovoxsbzudehquaovgmnnooe/Build/Intermediates/PrecompiledHeaders/POSSDKForIOSLIB-Prefix-cfcbmooemqunxmehfbebereyakbw/POSSDKForIOSLIB-Prefix.pch.pch error: '/Users/liangchenying/Library/Developer/Xcode/DerivedData/POSSDKForIOSLIB-bmkvfovoxsbzudehquaovgmnnooe/Build/Intermediates/PrecompiledHeaders/POSSDKForIOSLIB-Prefix-cfcbmooemqunxmehfbebereyakbw/POSSDKForIOSLIB-Prefix.pch.pch' does not exist Debugging will be degraded due to missing types. Rebuilding the project will regenerate the needed module files.7

After upgrading to iOS 18.4, I noticed that launching a debug build from Xcode becomes extremely slow. The same app with the same large debug binary (~1GB) launches normally on devices running iOS 18.3. This issue seems specific to iOS 18.4, possibly related to the way the OS handles large debug binaries or symbols during the launch process. Steps to Reproduce: Connect an iPhone running iOS 18.4 to a Mac with Xcode. Build and run an app using Xcode in Debug mode. Observe the extended launch time. Re-run the same process on another iPhone with iOS 18.3 — launch is fast. Expected Result: Debug launch should be fast and consistent across iOS versions. Actual Result: Debug launch is significantly slower on iOS 18.4 for large binaries (~1GB). Environment: Xcode version: 16.0 macOS version: 15.4 Device: iPhone [model] iOS version: 18.4 (problematic), 18.3 (no issue)

Xcode 16.3 simulator slow to load - unusable

The app stops on the breakpoint when "All Runtime Issues" is added. If I disable the breakpoint, the app runs normally. Is there a new project setting to avoid this breakpoint from being set. It does not appear to be a valid error. I am running Xcode 16.2. I edited the "Type" field in the breakpoint box. This occurs with the "System Frameworks" option only.