Issues in building package for iOS App

I have built in flutter and tried to deploy it on Appstore after testing, but I have been facing issues while deploying it to the App Store.
When the built is completed I face the below error

Code Block 
Warning: unable to build chain to self-signed root for signer "iPhone Distribution: Mark Davids (*********)"
		/Users/ramneek/Downloads/chat_app-master 2/build/ios/Release-iphoneos/Runner.app/Frameworks/App.framework/App: errSecInternalComponent
		Command PhaseScriptExecution failed with a nonzero exit code
		note: Using new build system
		note: Building targets in parallel
		note: Planning build
		note: Constructing build description
Encountered error while building for device.

I have re-installed all the required certificates checked the profiles.

I have configured provisioning profile manually.
How should I do it to make sure that I upload my flutter application successfully?