Build failed with an exception

[ganlulu2018]

When I try to compile, it prompts several errors as below :

/C:/src/flutter/.pub-cache/hosted/pub.dartlang.org/bot_toast-2.2.1/lib/src/key_board_safe_area.dart:12:48: Error: No named parameter with the name 'nullOk'.
MediaQueryData data= MediaQuery.of(context,nullOk: true);
^^^^^^
/C:/src/flutter/packages/flutter/lib/src/widgets/media_query.dart:818:25: Context: Found this candidate, but the arguments don't match.
static MediaQueryData of(BuildContext context) {
^^
/C:/src/flutter/.pub-cache/hosted/pub.dartlang.org/flutter_slidable-0.5.4/lib/src/widgets/slidable.dart:246:20: Error: The method 'inheritFromWidgetOfExactType' isn't defined for the class 'BuildContext'.

• 'BuildContext' is from 'package:flutter/src/widgets/framework.dart' ('/C:/src/flutter/packages/flutter/lib/src/widgets/framework.dart').
  Try correcting the name to the name of an existing method, or defining a method named 'inheritFromWidgetOfExactType'.
  return context.inheritFromWidgetOfExactType(SlidableData);
  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  /C:/src/flutter/.pub-cache/hosted/pub.dartlang.org/flutter_slidable-0.5.4/lib/src/widgets/slidable.dart:541:17: Error: The method 'inheritFromWidgetOfExactType' isn't defined for the class 'BuildContext'.
• 'BuildContext' is from 'package:flutter/src/widgets/framework.dart' ('/C:/src/flutter/packages/flutter/lib/src/widgets/framework.dart').
  Try correcting the name to the name of an existing method, or defining a method named 'inheritFromWidgetOfExactType'.
  context.inheritFromWidgetOfExactType(_SlidableScope);
  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^

Please help as I do not have any idea how to solve this.
Thanks.