Cannot create build

[majidejaz]

Running Gradle task 'assembleDebug'...
../development/flutter/.pub-cache/hosted/pub.dartlang.org/flutter_math_fork-0.3.3+1/lib/src/widgets/selectable.dart:407:7: Error: The non-abstract class 'InternalSelectableMathState' is missing implementations for these members:

• TextSelectionDelegate.copySelection
• TextSelectionDelegate.cutSelection
• TextSelectionDelegate.pasteText
• TextSelectionDelegate.selectAll
  Try to either
• provide an implementation,
• inherit an implementation from a superclass or mixin,
• mark the class as abstract, or
• provide a 'noSuchMethod' implementation.

class InternalSelectableMathState extends State
^^^^^^^^^^^^^^^^^^^^^^^^^^^
../development/flutter/packages/flutter/lib/src/services/text_input.dart:985:8: Context: 'TextSelectionDelegate.copySelection' is defined here.
void copySelection(SelectionChangedCause cause);
^^^^^^^^^^^^^
../development/flutter/packages/flutter/lib/src/services/text_input.dart:965:8: Context: 'TextSelectionDelegate.cutSelection' is defined here.
void cutSelection(SelectionChangedCause cause);
^^^^^^^^^^^^
../development/flutter/packages/flutter/lib/src/services/text_input.dart:973:16: Context: 'TextSelectionDelegate.pasteText' is defined here.
Future pasteText(SelectionChangedCause cause);
^^^^^^^^^
../development/flutter/packages/flutter/lib/src/services/text_input.dart:979:8: Context: 'TextSelectionDelegate.selectAll' is defined here.
void selectAll(SelectionChangedCause cause);
^^^^^^^^^

FAILURE: Build failed with an exception.