Warning: session_start(): Function spl_autoload_call() hasn't defined the class!

getting this at the top of the screen in admin

Warning: session_start(): Function spl_autoload_call() hasn’t defined the class it was called for in /web1/user50098/website/wp-content/plugins/wonderm00ns-simple-facebook-open-graph-tags/wonderm00n-open-graph.php on line 959

think somthing might have been added to functions, header or index.php

its a clash with “All-in-One Event Calendar by Time.ly” so far but both were working fine yesterday!

https://www.gainsboroughartworks.co.uk

https://www.ads-software.com/plugins/wonderm00ns-simple-facebook-open-graph-tags/