flutter - Dart 未处理的异常：NoSuchMethodError：在 null 上调用了方法“cast”。聪明的

Question

我正在使用 CleverTapPlugin.getDisplayUnitForId() 获取本机显示

var val = 等待 CleverTapPlugin.getDisplayUnitForId(id);

[VERBOSE-2:shell.cc(93)] Dart Unhandled Exception: NoSuchMethodError: The method 'cast' was called on null.
Receiver: null
Tried calling: cast<String, dynamic>(), stack trace: #0      Object.noSuchMethod (dart:core-patch/object_patch.dart:63:5)


Flutter 2.5.2 • channel stable • https://github.com/flutter/flutter.git
Framework • revision 3595343e20 (3 months ago) • 2021-09-30 12:58:18 -0700
Engine • revision 6ac856380f
Tools • Dart 2.14.3
#1      CleverTapPlugin.getDisplayUnitForId (package:clevertap_plugin/clevertap_plugin.dart:701:21)**strong text**