Well I hit another dead end. I added a new class to my server I made (I followed the tutorial in the tutorial list) but after recompiling it the client just has a black screen. Instead of using the client-108.bin they told me to, I used client-9.bin because it was the one with the classes in it. It gives a weird error at the end of my Server when I open the client, so here it is. Hope somebody can help.
https://imgur.com/YOUdqcu