Error evaluating AUC

[tommyvcc]

Dear

Thank you very much for the hard work.
I am trying to evaluate the AUC
It is working very well for the training and validation dataset , but not work for the test dataset and I am getting the following error:

censoring survival function is zero at on or more time points

I wonder how to fix this problem?

[chiragnagpal]

you are evaluating AUC at a time point which was never seen in the training data. you need to make sure that the maximum time of the test data is less than of the training data.

[tommyvcc]

Thank you very much for your reply
Is there a code to do that?
I would be very grateful if you can share it.

Thank you very much
Looking forward to hearing back from you