Game Crashes when I log into my.mineadventure.net

My game crashes when I log into the server. This is my main survival server, and I am worried.(I am not the owner), first, my game crashed, when going into gamemode 0. I then reloged, only to be greeted by the death screen. I clicked "respawn" multiple times, only to be surprised bu yet, another crash. I then logged into it again, and at my spawn point, another crash(immediately after joining). I re-downloaded .minecraft, but that gave me about a half of a second more playtime, with yet another crash. Please help me mojang, you problably know more about this than I do.