java.lang.IllegalArgumentException：Target不能为null

Question

我尝试了拖拽式面板演示......但我收到了一些错误，就像这样。

java.lang.RuntimeException: Unable to start activity
ComponentInfo{com.test.videoactivityanimation/com.test.videoactivityanimation.YoutubeSampleActivity}:
java.lang.IllegalArgumentException: Target must not be null..