Big problem : cannot create

Hi, i describe my problem about a new instalation

when i try to add a new video, i can’t without create a new category (ok this is not a bug)

But when i want to create a category i have got this message :
“Warning: mysql_fetch_array() expects parameter 1 to be resource, boolean given in /home/manipfes/public_html/wp-content/plugins/contus-video-gallery/admin/controllers/ajaxplaylistController.php on line 53”

If i try with the category menu, nothing work and i have no error message.

Thank you
note : i am on a multisite installation (network)

https://www.ads-software.com/plugins/contus-video-gallery/