I'm getting errors in every variable like
The non-nullable variable '_mediaQueryData' must be initializedThe non-nullable variable 'screenWidth' must be initialized.The non-nullable variable 'screenHeight' must be initialized.The non
我正在使用不可为空的类型,并将其添加到我的analysis_options.yaml中 enable-experiment:我有一个代码生成器[SEVERE] xyz.dart:95:7: Error: This requires the 'non-nullable' experiment to be enabled.Try enabling如何向flutter packages pub run传递--enable-experiment:non-nullable</e
C:\tofiq\flutter\bin\cache\pkg\sky_engine\lib\ui\channel_buffers.dart:152:17 - This requires the 'non-nullableC:\tofiq\flutter\bin\cache\pkg\sky_engine\lib\ui\channel_buffers.dart:88:62 - This requires the 'non-nullableC:\tofiq\flutter\bin\cache\pkg\sky_engine\lib\ui\chan
You can enable the experiment using the '--enable-experiment=non-nullable' command line option.You can enable the experiment using the '--enable-experiment=non-nullable' command line option.You can enable the experiment using the '--enable-experiment=no
You can enable the experiment using the '--enable-experiment=non-nullable' command line option.You can enable the experiment using the '--enable-experiment=non-nullable' command line option.You can enable the experiment using the '--enable-experiment=no
{required String q, required bool a}) { questionAnswer = a;} 错误显示如下: Non-nullableNon-nullable instance field 'questionAnswer' must be initialized. 谁来帮帮忙
NativeArray,并得到了以下错误:
泛型类型或方法Realtime.Messaging.Internal.ConcurrentDictionary<string,Chunk>' must be a non-nullableuse it as type parameter‘中的Realtime.Messaging.Internal.ConcurrentDictionary<string,Chunk>' must be a non-nullable
我在尝试使用的节点应用程序中遇到以下错误: { [GraphQLError: Cannot return null for non-nullable field Issue.id.]message: 'Cannot return null for non-nullable field Issue.id.
这就是为什么我在analysis_options.yaml中添加了以下内容的原因 enable-experiment:一切正常,直到我再次打开电脑时不管我现在做什么,我都会收到一条消息说This requires the 'non-nullable' experiment to be enabled.
这是一个纯粹的Dart应用程序。
t = null; // Error CS0403 Cannot convert null to type parameter 'T' because it could be a non-nullable;
if(f(10) is null) // Error CS0037 Cannot convert null to 'int' because it is a non-nullable value