Final answer:
The problem in the sentence is that an adverb clause cannot function as a direct object.
Step-by-step explanation:
The problem in the sentence is that an adverb clause cannot function as a direct object. In a sentence, a direct object typically receives the action of the verb. It is usually a noun or pronoun. Adverb clauses, on the other hand, function as adverbs and modify verbs, adjectives, or other adverbs. They cannot serve as direct objects.