When you created your graphic, did you place (Import) a still or a movie into the project? If so, the error is telling you that LiveType can’t find that element. Did you move it or delete it after saving the LiveType project by chance? If you moved it, just reopen the file in LiveType and it will ask you if you want to find the missing element. Just navigate to the file and click OK and then resave. If you don’t need it and have deleted it, just open the file and delete the track that missing element was on. Then resave the file under the same name. It should now appear in FCP the correct way.
Tom