Hello please guys this Erorr confusing me . any type of suggesting thx forward ~

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                 ^^^^^^

: Error: Expected identifier, but got ‘this’.
../…/widgets/framework.dart:4944
Widget build() => (widget as StatelessWidget).build(this);
^^^^
: Error: Expected identifier, but got ‘super’.
../…/widgets/framework.dart:4948
super.update(newWidget);
^^^^^
: Error: Undefined name ‘widget’.
../…/widgets/framework.dart:4949
assert(widget == newWidget);
^^^^^^
: Error: Setter not found: ‘_dirty’.
../…/widgets/framework.dart:4950
_dirty = true;
^^^^^^
: Error: Method not found: ‘rebuild’.
../…/widgets/framework.dart:4951
rebuild();
^^^^^^^
Failed to compile application.

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