使用NetBeans，在我使用setVisible的地方找不到符号错误

I have seen all of the posts on this site regarding the cannot find symbol error and none of them answered my question so here I am. To give you a better idea of what I am doing, I am creating a video store program that will send messages to a server which will send messages to a database and back and forth.I have seen all of the posts on this site regar