Warning: call_user_func() expects parameter 1 to be a valid callback

  • I’m using a Jetpack 3.0.2 (with with 42U Jetpack Booster) contact form for an adoption application on my site. It worked for months, but now I get the following error for every form field:

    Warning: call_user_func() expects parameter 1 to be a valid callback, no array or string given in /home3/savealif/public_html/wp-includes/shortcodes.php on line 287

    I’m using theme Twenty Eleven. Please help as I have no idea what to do! The page is: https://savealifepets.org/?page_id=23

    thanks!

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