What does EXTRA-MODALITIES mean?

[bkpcoding]

Hey, I am doing study and we have file structure similar to this https://fets-ai.github.io/FL-PoST/process_data. But after registering the dataset and starting to prepare it, it gives following error,

The preprocessing stage finished executing, but the data doesn't appear to be ready. This most probably means you have outstanding tasks. Please verify the status of your data by using the monitoring tool.

This thing appears in the sanity check.

And if I see the rano-monitoring tool, it says Extra Modalities to all the files and even medperf dataset -ls --mine says execution status finished: progress: {'Stage -1.2': 100%'}

So, I don't know what is causing this extra modalities to appear and how we can get rid of it?