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Operand of null-aware operation ‘!‘ has type ‘SchedulerBinding‘ which excludes null.
2022-07-07 05:04:00 【Liu Xiaobo】
Error report as shown in the figure
…/…/Documents/flutter/.pub-cache/hosted/pub.flutter-io.cn/animations-2.0.2/lib/src/open_container.dart:631:24: Warning: Operand of null-aware operation ‘!’ has type ‘SchedulerBinding’ which excludes null.
- ‘SchedulerBinding’ is from ‘package:flutter/src/scheduler/binding.dart’ (‘…/…/Documents/flutter/packages/flutter/lib/src/scheduler/binding.dart’).
SchedulerBinding.instance!
reason
yes animations The version of the library is low , You need to update 
Repair
Increase the version number to large enough , I add here to 2.0.3 That's all right. 
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