eltwise_layer.cpp:34 check failed: bottom[i]->shape() == bottom[0]->shape(). error

[daiwenjun2017]

I change with py-rfcn with FPN .I just use 6 feature map (res2\res3\res4\res5 and pooling 6) to proposal anchors,and the rest part unchanged. The net work normal until sloving....the error is eltwise_layer.cpp:34 check failed: bottom[i]->shape() == bottom[0]->shape().
I do not know where the problem is? Auguably ,if the blobs has some problem,the ettwise layer problem may come up earlier and can not creating corresponding layers. please give me some advices.
Thanks!!!