lib/ui/widgets/topBar.dart:87:17: Error: The getter 'BlacklistingTextInputFormatter' isn't defined for the class '_TopBarState'.

[sandeepnarula999]

lib/ui/widgets/topBar.dart:87:17: Error: The getter 'BlacklistingTextInputFormatter' isn't defined for the class '_TopBarState'.

• '_TopBarState' is from 'package:elearning/ui/widgets/topBar.dart' ('lib/ui/widgets/topBar.dart').
  Try correcting the name to the name of an existing getter, or defining a getter or field named 'BlacklistingTextInputFormatter'.
  BlacklistingTextInputFormatter.singleLineFormatter
  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

FAILURE: Build failed with an exception.

[khetshim]

please change it to..
FilteringTextInputFormatter.singleLineFormatter