Error: options page not found.

Hello,

I am a new user of WPMU DEV SEO and I'm stuck in step 4. I've generated a SEOMOZ key and member id, but after pressen the Save button I receive the 'Error: options page not found' notice.

I am running WP 3.1 without BuddyPress, just a single site with the BuddyPress Business 3.6.5 theme.

I've checked server logs, but don't get any error message there. Any suggestions on this matter?

Thanks in advance.