Hello,
Can you make sure that the core WordPress files are complete? If so, please try the plugin with the default theme.
Hi Dzikri,
The error is related to the “Heroic Knowledge Base” Plugin. As soon as I deactivate it, things started to work.
So for some reason your Menu Icons is not compatible with the “Heroic Knowledge Base” – and vice versa.
Any idea how to fix this?
FWIW: This is the response from HeroThemes regarding this issue – maybe this is helpful for solving the error?
Hi Marco,
I have made a note of this incompatibility on our development notes.
During testing I noted that if you comment out the following line (around 206) in menu-icons/includes/picker.php, it works, but you should be aware this is some sort of security check, so advise caution if using the modified code on a live site.
check_admin_referer( 'update-nav_menu', 'update-nav-menu-nonce' );
to
//check_admin_referer( 'update-nav_menu', 'update-nav-menu-nonce' );
I was unable to debug any further than this, but hopefully it helps towards finding a better solution for you.
Let me know if you do get to the bottom of it.