NoSuchMethodErrorgetter'value'在null上被调用

Question

我正在尝试播放本地视频。用户选择视频并在按下按钮时播放。代码为Here。但是我遇到此错误，似乎也无法解决。

I / flutter（7097）：W小工具库引起的异常CA ════════════════════════════

I/flutter ( 7097): The following NoSuchMethodError was thrown building VideoChoosePost(dirty, state:
I/flutter ( 7097): _VideoChoosePostState#bd944):
I/flutter ( 7097): The getter 'value' was called on null
I/flutter ( 7097): Receiver: null 
I/flutter ( 7097): Tried calling: value

Answer 1

您没有在代码中的任何地方实例化playercontroller，因此它的值为null。