hellomaxi on "[Plugin: Taxonomy Metadata] PHP fatal error on WP update to 4.4"

I have this error:

Fatal error: Cannot redeclare add_term_meta() (previously declared in /homepages/15/d196895470/htdocs/wordpress/wp-includes/taxonomy.php:1757) in /homepages/15/d196895470/htdocs/wordpress/wp-content/plugins/taxonomy-metadata/taxonomy-metadata.php on line 97

No access to whole website. *PLS HELP*