The explosion of clown crews allow unique styles of dance to evolve, such as krumping. Identify and explain the subject-verb agreement error. Rewrite the sentence correctly.

The error in the given sentence above is the wrong verb form being used. The subject is "The explosion of clown crews" and this is a singular subject because it refers to the word "Explosion". Therefore, the verb should also be singular which is "allows". Here is the correct sentence: The explosion of clown crews allows unique styles of dance to evolve, such as krumping.