Reply To: Form is no longer submitting…

Here’s the error message preventing the ajax part from working.

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<b>Warning</b>:  Invalid argument supplied for foreach() in <b>/nas/wp/www/staging/union/wp-admin/includes/plugin.php</b> on line <b>1290</b><br />

Google first results say it’s the “Event Organiser”, do you use it? Else read more about it, as it seems it can have many reasons.
Regards