I tried this, but did first of all not find the phrase under function __construct(). I then copied it out from here and inserted it directly after “function menu(){“.
I’m getting closer, the tab is back again on the edit-window but tells me “Warning: call_user_func() expects parameter 1 to be a valid callback, class ‘ProjectManagerAdminPanel’ does not have a method ‘addMetaBox’ in /home/unterkla/www/scw.unterklassig.ch/wordpress/wp-admin/includes/template.php on line 958”
Can anybody help me?
