When I close WA then open it later my teams are no longer there. Also when I go into the missions and click a team it says Error: Could not open/creat team file.

What do I do to fix it?

Run Worms Armageddon as an administrator.

Run Worms Armageddon as an administrator.
Or at least with admin rights in your WA installation folder to be able to write the team file.

I'm haveing the same problem what did you do to correct