我已经多次看到UIAutomator出现此问题.尝试转到其他屏幕，获取该屏幕的元素，然后再次返回该屏幕.尝试再次获取元素，并且应该可以正常工作.

I have seen this problem with UIAutomator so many times. Try going to some other screen, fetch the elements of that screen and then come back to this screen again. Try to fetch the elements again and should work.