syncfusion_flutter_pdfviewer-20.1.60-beta Error: Method 'addObserver' cannot be called on 'WidgetsBinding?' because it is null

Question

Error occurring while using syncfution_flutter_pdfviewer-20.1.60-beta version enter image description here

user_13400001 · Answer

As error said you should change

WidgetsBinding?.instance.addPostFrameCallback

To

WidgetsBinding.instance?.addPostFrameCallback

user_13432447 · Answer

Kindly upgrade to the latest version of Flutter SDK to get the issue resolved. Flutter SDK setup link for the latest version: https://docs.flutter.dev/get-started/install/windows#get-the-flutter-sdk