Bad state: Unexpected diagnostics: after flutter upgrade to 1.20.1

Question

What is the issue?

xxx@xxx-Inspiron-14-3467:~/xxx$ flutter pub run build_runner build[INFO] Generating build script...
[INFO] Generating build script complete         


        

Answer 1

After spending more that 3 hours, finally I managed to solved.

For those who have upgraded to flutter version 1.20.1 or above, make sure you add this line in pubspec.yaml.

dependency_overrides:
  analyzer: '0.39.14'

Answer 2

try it:

1- flutter clean

2- go on dev channel: flutter channel dev

3- upgrade: flutter upgrade --force

4- flutter pub get

5- try to build

6- back on stable or master channel: flutter channel stable (flutter channel master)

7- upgrade: flutter upgrade --force

Answer 3

I had the same issue:

Please try this in your pubspec file

dependency_overrides:
  analyzer: '0.39.17'    
  build_resolvers: '1.3.10'