My wiki host (MyWikis) is having problems with login. Users can't create accounts and update.php is useless. Please try creating an account there, thanks!
Topic on Project:Support desk
You have a problem with your database. If you modified the login screen with additional fields (which it appears that you did), did you remember to add the required column to the table in question?
I installed Extension:NewSignupPage, but now I did all necessary and it's still not working.
Apparently it did not create the correct table row for you.
Now what?
Either try upgrading your MediaWiki release to a pre-release version like 1.20 alpha or try creating the row yourself (easy if you can use PHPMyAdmin).
ok, thanks!