paddle报错SystemError: (Fatal) Blocking queue is killed because the data reader raises an exception.

在使用paddle的dataloader的时候，如果def getitem(self, index):函数发生异常会报错：ERROR:root:DataLoader reader thread raised an exception!Traceback (most recent call last): File "train.py", line 28, in <module> for i, (image1, image2, label) in enumerate(loader()