Please help!! Either the gallery director or the artists (is, are) at the center of that crowd.

Either the gallery director or the artists are at the center of that crowd.

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.

for example: in, he, a,from