Error (1): Unable to 'pub upgrade' flutter tool. Retrying in five seconds... (9 tries left)

Question

I am trying for flutter doctor and the following error was shown

Running pub upgrade...
The system cannot find the path specified.
Error (1): Unable to 'pub upgrade' flutter tool. Retrying in five seconds... (9 tries left)

Waiting for 2 seconds, press CTRL+C to quit ...
Terminate batch job (Y/N)?

the above initializing was shown for 4 hours. What may be the issue? Can anyone please help with this

Answer 1

I fixed that by:

1. Ctrl+C to stop infinite error loop.
2. Kill the Dart process in Windows Task Manager.
3. Delete the cache folder located in flutter/bin directory.
4. Run in command line flutter pub cache repair.
5. Run flutter doctor