StopIteration Error while training from scratch

[grimhandler09]

Hello,
I have been getting the StopIteration error while training from scratch on custom data. I am using the default parameters provided in the yml file with the cell partitions, message packets of the custom data, and the train and validation mapping of the custom data respectively. I checked how the data is in both the custom and the given dataset in this repo and they are similar. Unsure as to why I am getting this error message.
I have attached a screenshot of my error below:

[QianC95]

I'm not familiar with this error, but I noticed that you were training on custom data. Have you modified the yml file? I'm also trying to train it on custom data, and I don't know how to generate the train_label_mapping and val_label_mapping files. The labels in resources/mp16_places365_mapping_h3.json and resources/yfcc_25600_places365_mapping_h3.json looks meaningless. Do you have any clues?