A very strange error occurs when a certain team member tries to compile our codebase on his mac book: MappingModelCompile /Users/user/Library/Developer/Xcode/DerivedData/App-azadclhkqltedgctpzfegyczvdip/Build/Products/Debug-iphonesimulator/AppCore.framework/CustomMigration.cdm /Users/user/Documents/Projects/company/ios/AppCore/Model/Mappings/CustomMigration.xcmappingmodel (in target 'AppCore' from project 'App') 		cd /Users/user/Documents/Projects/company/ios 		/Applications/Xcode.app/Contents/Developer/usr/bin/mapc --sdkroot /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator14.3.sdk --iphonesimulator-deployment-target 12.2 --module AppCore /Users/user/Documents/Projects/company/ios/AppCore/Model/Mappings/CustomMigration.xcmappingmodel /Users/user/Library/Developer/Xcode/DerivedData/App-azadclhkqltedgctpzfegyczvdip/Build/Products/Debug-iphonesimulator/AppCore.framework/CustomMigration.cdm 2021-01-12 10:04:18.640 mapc[23525:139372] * Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '* -predicateFormat only defined for abstract class.	Define -[NSFetchRequestExpression predicateFormat]!'** First throw call stack: ( 0	 CoreFoundation											0x00007fff204b76af __exceptionPreprocess + 242 1	 libobjc.A.dylib										 0x00007fff201ef3c9 objc_exception_throw + 48 2	 Foundation													0x00007fff2143a610 _NSRequestConcreteObject + 0 3	 Foundation													0x00007fff212d9520 -[NSExpression predicateFormat] + 39 4	 IDEModelFoundation									0x000000010b03f34f -[XDDevEntityMapping sourceExpressionAsString] + 48 5	 IDEModelFoundation									0x000000010b0080c3 -[XDMappingCompilerSupport generateCompileResultForMappingModel:sourceModelHashes:destinationModelHashes:] + 1942 6	 IDEModelFoundation									0x000000010b008d24 -[XDMappingCompilerSupport compileSourcePath:options:] + 1211 7	 mapc																0x000000010a68d553 main + 2074 8	 libdyld.dylib											 0x00007fff20360621 start + 1 ) libc++abi.dylib: terminating with uncaught exception of type NSException Command MappingModelCompile failed with a nonzero exit code Even a clean checkout with force-removed DerivedData ends up with this. Strangely enough, at the same time all others and CI are able to build just fine. We are using Xcode 12.3 Build 12C33. I've tried to find anything about this on the internet but it seems to be a very exotic case. Any suggestions are highly appreciated.