Plays that personified virtues and vices were known as

Plays that personified virtues and vices were known as morality plays.

Explanation:

There was a kind of play during the 15th and 16th centuries that were known as Morality plays or morality they were commonly drama and they were very popular around Europe, the principal characteristic of this kind of play is that they represented vice and virtue as characters in their stories as a way to teach morals to people.

type of error:

the error in the sentence is a "dangling modifier". a dangling modifier is a phrase, word or clause that "dangles" because there is not target to modify. in this case, "after mopping the floor" is the dangling modifier since it has no word to modify. the noun "house" cannot mop the floor; therefore there is a mistake in the writing of the sentence.