"ValueError: graph contains cycles" when running "mnist_100_conv_gamma" and "cifar_4k_gamma"

Hi, I came into some error that "ValueError: graph contains cycles" from training main-loop in theano.
And this only happened when running gamma model with conv layers on both dataset "mnist" and "cifar". But if I run the "Conv-FC" model or supervised learning model on two datasets, the training can work. I am not sure how to debug for this error. Could you please help with this issue? Thanks!