Background Manager Stop Working!

Good Night Am ussing This cool Plugin Background Manager and today Stop Work no idea why i dint Install nothing Rare The only plugin i Install Was the Ultimate Facebook plugin – WPMU and i delete again To see if the problem was this Facebook plugin, but no. i reinstall and install 20 times the Background Manager and no case, Still no working and i rellllly need it, my site are this one

https://vskgaming.com.ar/multimedia

and need this plugin becouse i made 30 caregory and on each one i set one Custom image ,,, so now all my site looks like Crap ;(

i hope some one can give me a hand If need one usser as admin to take one look just ask

Thans in advance ( am kinda desesperate )

Best regards.