I have the same problem. Please someone update or give a fix.
I have the same issue when I installed the plugin.
Old pages (before plugin installed) were not accessible anymore. Every action (updating menu / adding pages-media-post) triggers the error as mentioned above and a 404-error when accessing them.
Even deactivating the plugin keeps causing trouble. Going to reinstall everything – is going to be quicker & easier then waiting for a (possible) fix.
Plugin looked promising but causing too much trouble, as I see other WP-site owners experiencing the same problem. Seems the last version is a Beta-version.
I’ve got the same problem too after updating to 3.0.10, deactivate or deleting do nothing.
I got two message.
Warning: call_user_func_array() [function.call-user-func-array]: First argument is expected to be a valid callback, ‘bwps_admin_construct::backup_scheduler’ was given in /home/rakanikl/public_html/***/wp-includes/plugin.php on line 405
Warning: Cannot modify header information – headers already sent by (output started at /home/rakanikl/public_html/naziman.com/wp-includes/plugin.php:405) in /home/rakanikl/public_html/***/wp-includes/pluggable.php on line 866
Same thing happened on my site http://streetlovely.com. i deactivated and am reinstalling 3.0.9
same error:
Warning: call_user_func_array() [function.call-user-func-array]: First argument is expected to be a valid callback, ‘bwps_admin_construct::backup_scheduler’ was given in /home/dskmusic/public_html/wp-includes/plugin.php on line 405
