Target kernel_snapshot failed: Exception After using this package

[AmarchandK]

/C:/Users/Admin/AppData/Local/Pub/Cache/hosted/pub.dev/universal_html-2.2.2/lib/src/html/dom/element_subclasses.dart:2752:30: Error: The argument type 'String?' can't be assigned to the parameter type 'Object' because 'String?' is nullable and 'Object' isn't.

• 'Object' is from 'dart:core'.
  final parsed = css.parse(text);
  ^

Target kernel_snapshot failed: Exception
2

FAILURE: Build failed with an exception.