an author from state a filed a claim in federal court sitting in state b against a publisher headquartered in state b. the complaint alleged that the publisher plagiarized a portion of the author's book and asserted both a copyright infringement claim under federal law and an unfair business practices claim under an applicable state b statute. at trial, the publisher presented evidence that the author never filed the copyright infringement claim with the appropriate federal agency, as required by the federal statute, thereby invalidating the copyright infringement claim. the claim for unfair business practices, however, was still capable of obtaining a favorable verdict. the publisher moved for dismissal of the state law claim as well. how should the federal court rule?