issue with wordpress 4.7

  • Hi, I am currently getting this error on the RSVPfy plugin for wordpress.

    The WordPress version I am using is 4.7

    Warning: call_user_func_array() expects parameter 1 to be a valid callback, no array or string given in /home/sollymay1/public_html/wp-includes/class-wp-hook.php on line 298

    It started just after the update, so I know there might be a compatibility issue.

    Best,

    Salomon

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