I can not create a app for the app store. I'm getting the following error message

bill banks 6 Reputation points
2021-06-07T14:19:47.177+00:00

/Library/Frameworks/Mono.framework/External/xbuild/Xamarin/iOS/Xamarin.Shared.targets(3,3): Warning: warning: /var/folders/24/8k48jl6d249_n_qfxwsl6xvm0000gn/C/org.llvm.clang.runner/ModuleCache/1S4DKV4D3U46T/ObjectiveC-2RDOZQ5UE3FMD.pcm: No such file or directory (MyVoiceApp.iOS)
/Library/Frameworks/Mono.framework/External/xbuild/Xamarin/iOS/Xamarin.Shared.targets(3,3): Error: /usr/bin/codesign exited with code 1
(MyVoiceApp.iOS)
/Library/Frameworks/Mono.framework/External/xbuild/Xamarin/iOS/Xamarin.Shared.targets(3,3): Error: Failed to codesign 'bin/iPhone/Debug/device-builds/iphone9.2-14.4.2/MyVoiceApp.iOS.app//Frameworks/grpcpp.framework/grpcpp': Warning: unable to build chain to self-signed root for signer "Apple Distribution: Bill Banks (5Z8C2NPWCK)"
/Users/ourweb1/Desktop/mycode/MyVoiceApp/MyVoiceApp/MyVoiceApp.iOS/bin/iPhone/Debug/device-builds/iphone9.2-14.4.2/MyVoiceApp.iOS.app/Frameworks/grpcpp.framework: errSecInternalComponent

     (MyVoiceApp.iOS)
Developer technologies | .NET | Xamarin
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