TypeError: Cannot handle this data type:(1,1,400),u1

[Superman-Valencia]

Hi!
When i ran the code, l met the following error: TypeError: Cannot handle this data type:(1,1,400),u1。
I gussed it maybe related with PIL. When i comment out "logger.log_validation(val_loss, model, y, y_pred, iteration)", everything is right.
Did you meet the same situation or whelther it would have other influence?