Hello. A while ago I developed this site curlyproductions.co.uk
The owner recently bought a new domain and had his IT guys copy the content to it:
There is now an error:
Warning: call_user_func_array() expects parameter 1 to be a valid callback, function '_show_post_preview' not found or invalid function name in /var/sites/o/onlinevideoproduction.co.uk/public_html/wp-includes/plugin.php on line 406
As you can see, all the links and content come from the original domain.
Any ideas what's going on? It's using the latest WordPress version.
I have quite a few plugins so would like to avoid having to go through and deactivate them if possible. I've tried changing the theme and got the same error.