Unable to join friend's modded minecraft world.

Screen stays on Locating Server screen when I try to join friend's world with origins mod. They say my character is on the world (they can't punch it though) but I'm not. When I press cancel my screen is still on Locating Server so I have to fully close Minecraft. I am able to join my worlds and other's except for this one with origins. I do not know how to fix it.