how can i fix my hoover quattro whisper 1300?

On fast spin it started making really bad noises as if the drum was unbalanced. I stopped it then restarted on rinse cycle & it did the same again. Then the door would not open. I tried it on another cycle & nothing happend then "error" came up. I did manage to open the drum & found a lot of gunk coming into the machine from the drain holes at the back.

Jan
August 2011