How to apply proc_df on test data?

Has anyone tried making predictions on the actual test data? I am having some problems with proc_df function. After applying apply_cats on the data, proc_df produces the AttributeError: Can only use .cat accessor with a 'category' dtype error. Please help

I got this problem for dates when i didnt use:
add_datepart(train,‘Date’)

If you have any type of date its worth trying.

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I found what i was doing wrong. I was applying apply_cats after making all the other changes to df_raw. Make sure you make a copy of df_raw after applying train_cats