WidgetsBinding.instance?.addPostFrameCallback((_) {

[haleem13]

hi there,
i am facing this problem can you please help me to fix this.
Error
/C:/flutter/.pub-cache/hosted/pub.dartlang.org/percent_indicator-3.4.0/lib/linear_percent_indicator.dart:156:20: Warning: Operand of null-aware operation '?.' has type 'WidgetsBinding' which excludes null.

• 'WidgetsBinding' is from 'package:flutter/src/widgets/binding.dart' ('/C:/flutter/packages/flutter/lib/src/widgets/binding.dart').
  package:flutter/…/widgets/binding.dart:1
  WidgetsBinding.instance?.addPostFrameCallback((_) {
  ^

[diegoveloper]

run flutter doctor, which version of Flutter?