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'