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Site redirect / plugin error

  • 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:
    http://onlinevideoproduction.co.uk/

    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.

    Thanks!

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