D34dP0ol64

I've tried what seems like almost everything by now to try and get my modded minecraft server up and running, but every time I do there's always a problem except this one I haven't been able to fix so far. Everytime I load up minecraft it loads so beautifully smooth and shows me everything I want to see but when I go to multiplayer and try direct connecting to my server I always get a grey screen it loads and then says "Incomplete set of tags recieved from server. Please contact server operator." I've checked to make sure the mods match, and that they're compatible and I'm sure that they are, and I've even reread and rewatched all tutorials I could find, redownloaded java and jarfix but nothing seems to fix it, can someone on here help me figure out what the problem is?