PHP Error message on website needs fixed

  • as soon as I installed Youtube Pro plugin to show videos on my website your WP advanced PDF pro plugin is throwing an error at the top of my clients website. Can you please help me get rid of the error message.

    Warning: call_user_func_array() expects parameter 1 to be a valid callback, class ‘wpppdf’ does not have a method ‘ptp_pdfscheduleduration’ in /home/jamyer5/sandbox/wp-includes/class-wp-hook.php on line 288

    Warning: array_merge(): Argument #1 is not an array in /home/jamyer5/sandbox/wp-includes/cron.php on line 834

    Your help would be appreciated.

    The page I need help with: [log in to see the link]

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