VGG implementation error

I am getting the below error when in implemented vgg_16_bn on image data set. Help me out from this

Hi @sivanagendra.paruchu,
Can you post a link to your notebook?

https://colab.research.google.com/drive/1epVcKqNrF-r1mrL12T0n4poFw2fDVSxe#scrollTo=IvOT0lWfA1N3

Access requested, please check.