Error php activating the theme and ubermenu

Hi,
First of all, thank you for your work.

When I activate the theme, I have a php error :

Warning: count(): Parameter must be an array or an object that implements Countable in /homepages/36/d298216070/htdocs/mywebsite/wp-content/themes/crystalskull/themeOptions/admin/options-medialibrary-uploader.php on line 60

In addition, like other people in the forum, I do not have access to the menu page with ubermenu activated.
Indeed the page loads indefinitely. Would not this problem be related?

I have contacted Ubermenu support, and they say me :
“If this message does not disappear, it means that UberMenu has not been able to load.
This most commonly indicates that you have a javascript error on this page, which will need to be resolved in order to allow UberMenu to run.
So what is likely happening is that you are encountering a javascript error before UberMenu ever runs, which prevents UberMenu from running (and removing that loading message).”

Otherwise I tried:
– by re-installing wordpress
– disabling all other plugs
– changing the php version of the server

I only have this problem with this theme, not with the basic wordpress theme.

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