AttributeError: 'vgg16' object has no attribute 'drop_prob'

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Hello, the author, I used your program after the following error occurred, I would like to ask how to solve this problem.

Traceback (most recent call last):
File "bcnn.py", line 293, in
vgg = vgg16(imgs, 'vgg16_weights.npz', sess, isFineTune, drop_prob)
File "bcnn.py", line 48, in init
self.fc_layers()
File "bcnn.py", line 251, in fc_layers
tf.contrib.layers.dropout(fcw,self.drop_prob)),
AttributeError: 'vgg16' object has no attribute 'drop_prob'