Does it just go to a black screen when you sign on to the server? If so and you're still having this issue I had the same problem and solved it. Lemme know.

Had this exact same thing happen to me on a private vanilla server. I thought maybe I had to first use the alcohol tincture to disinfect the IV Kit? I know for an absolute fact it was the same blood type as mine because I was the only one on the server and had taken my own blood to act as an emergency transfusion for myself.