cant activate plugin on multisite

Hi devs,
i’m trying to activate “nextgen custom fields” on a multisite, but i can’t activate the plugin. all i got is the error “Das Plugin kann nicht aktiviert werden, da es einen fatalen Fehler erzeugt.”

Link: http://www/wp-admin/plugins.php?action=error_scrape&plugin=nextgen-gallery-custom-fields%2Fngg-custom-fields.php&_wpnonce=d331edd7aa

Can anyone help? thanks in adavance!!!!

https://ww.wp.xz.cn/plugins/nextgen-gallery-custom-fields/