the picture is a bit fuzzy but it looks like it just came apart on you. you gotta feed that spring back into the keeper and then get the hubs back in the proper way. i look at the gasket and find the big groove and line it upwith the big groove in the flange.
if you cant get the spring back in the keeper then you might need to replace it. you can find them at any wrecking yard (samauri, sidekickand i think even the troopers have them)
hope that helps
jason