زمان اجرای flutter doctor خطای 69 دریافت میکنم 
Building flutter tool...
Running pub upgrade...
Resolving dependencies... (5.4s)
Because flutter_tools depends on test any which doesn't exist (authorization failed), version solving failed.

Insufficient permissions to the resource at the https://pub.dev package repository.
You can modify credentials using:
   dart pub token add https://pub.dev
Error (69): Unable to 'pub upgrade' flutter tool. Retrying in five seconds... (9 tries left)