Mac OS Big sur Flutter install error, “Bad state: Future already completed”

it's showing like this.

Unhandled exception:
Bad state: Future already completed
#0      _AsyncCompleter.complete (dart:async/future_impl.dart:43:31)
#1      _NativeSocket.startConnect.<anonymous closure>.connectNext.<anonymous closure> (dart:io-patch/socket_patch.dart:678:23)
#2      _NativeSocket.issueWriteEvent.issue (dart:io-patch/socket_patch.dart:1043:14)
#3      _NativeSocket.issueWriteEvent (dart:io-patch/socket_patch.dart:1050:12)
#4      _NativeSocket.multiplex (dart:io-patch/socket_patch.dart:1071:11)
#5      _RawReceivePortImpl._handleMessage (dart:isolate-patch/isolate_patch.dart:168:12)
Error: Unable to 'pub upgrade' flutter tool. Retrying in five seconds...

I totally uninstall flutter from macOS Big Sur. but it's still showing the same result.



Read more here: https://stackoverflow.com/questions/64900664/mac-os-big-sur-flutter-install-error-bad-state-future-already-completed

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