The getter 'controller' isn't defined for the class 'BehaviorSubject'.

[sat12341234]

I get following error. Any idea how to fix it?
Thanks

"flight_details_bloc.dart",
"severity": 8,
"message": "The getter 'controller' isn't defined for the class 'BehaviorSubject'.\nTry importing the library that defines 'controller', correcting the name to the name of an existing getter, or defining a getter or field named 'controller'.",
"source": "dart",
"startLineNumber": 124,
"startColumn": 53,
"endLineNumber": 124,
"endColumn": 63,
"tags": []

[Ivanhoe160676]

Did you solved the issue? i was trying to solved too