Site broken after upgrade to WP5.0.4

Hi,
My site is broken after autoupdate to WP5.0.4. The problem seems to be in OptionTree
Notice: Only variables should be passed by reference in /datas/vol1/millesabords.net/var/www/htdocs/blog/wp-content/themes/kontrast-master/option-tree/ot-loader.php on line 329

Deprecated: Function create_function() is deprecated in /datas/vol1/millesabords.net/var/www/htdocs/blog/wp-content/themes/kontrast-master/option-tree/includes/ot-functions-admin.php on line 69

Warning: Cannot modify header information – headers already sent by (output started at /datas/vol1/millesabords.net/var/www/htdocs/blog/wp-content/themes/kontrast-master/option-tree/ot-loader.php:329) in /datas/vol1/millesabords.net/var/www/htdocs/blog/wp-includes/pluggable.php on line 1223

Thanks for you help