Value Error when categorical column is of dtype "Categorical"

[manujosephv]

Describe the bug When the categorical columns are of dtype Categorical in pandas, it throws this error. ValueError: Cannot setitem on a Categorical with a new category, set the categories first

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[DominikFilipiak]

Workaround: make sure that in your data frame all categorical columns are casted to string.

for c in cols_category:
    df[c] = df[c].astype("string") 
    df[c].fillna("na", inplace=True)