add (missing?) class: KeyError
add (missing?) class: KeyError

kuad9/review_study,murashitas/review,kdmsnr/review,masawada/review,murashitas/review,krororo/review,kmuto/review,krororo/review,suzuki/review,orangain/review,takahashim/review,krororo/review,suzuki/review,orangain/review,kuad9/review_study,kmuto/review,masawada/review,takahashim/review,kmuto/review