Errors?

[slammz]

I get this: http://puu.sh/BzHH

When I save settings in the admincp and then this: http://puu.sh/Bzrq

When logging in with dual authentication.

Any help? And how do I get read of the activity.php crap?

[Lynne]

dual authentication?

As for the error, try disabling your modifications/plugins and see if you still have this problem.
Note: To temporarily disable the plugin system, edit includes/config.php and add this line right under <?php

define('DISABLE_HOOKS', true);

Try a search regarding the activity stream since this has been covered many times.