Big mart sales using catboost

Hello All,
I am solving Big mark sales using catboost and followed the same step given in article

However, I m getting below error,
CatBoostError: Invalid type for cat_feature[non-default value idx=0,feature_idx=8]=12.6 : cat_features must be integer or string, real number values and NaN values should be converted to string.

Please suggest, appreciate your help in this.

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