Thread:Project:Support desk/extension Wikibase

hi I seem to have a problem with extension wikibase I have a problem in wikibase lib the error says

Warning: array_key_exists expects parameter 2 to be array, null given in /home/u733145970/public_html/extensions/Wikibase/lib/WikibaseLib.php on line 202

Warning: array_key_exists expects parameter 2 to be array, null given in /home/u733145970/public_html/extensions/Wikibase/lib/WikibaseLib.php on line 202

Fatal error: Class 'Wikibase\TemplateStore' not found in /home/u733145970/public_html/extensions/Wikibase/lib/WikibaseLib.php on line 221

could I please have some help to fix the error