vggmodel Err.

[jolt2017]

hi：
I confronted some problems when run
vggface = VGGFace(include_top = False, model = 'resnet50', input_shape = (224, 224, 3))

Cannot interpret feed_dict key as Tensor: Tensor Tensor("Placeholder_798:0", shape=(7, 7, 3, 64), dtype=float32) is not an element of this graph.

Did you have any suggestions to solve this problem?