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I have a problem now with nextgen pro Add gallery/Image on editing a gallery on a page or post (not from the admin bar menu option, its fine there). It is caused by IP geoblock (deactivating removes the error)
Warning: call_user_func() expects parameter 1 to be a valid callback, no array or string given in /srv/users/serverpilot/apps/wordpress/public/wp-includes/functions.php on line 2679
I am using the latest versions of both IP Feoblock and Nextgen Pro.