@freeben
This is a bug in the instapage plugin, I’m unable to find where I can report it to instapage so I’m writing it here.
Go to the file /wp-content/plugins/instapage/InstapageCmsPluginAjaxController.php
On line 339 there will be a InstapageCmsPluginHelper::checkResponse($response)
change it to
InstapageCmsPluginHelper::checkResponse($response, ”, false)
This is because this call echoes the response, resulting in two concatenated JSON responses in one http request which obviously results in a “can’t parse” error.
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This reply was modified 8 years, 3 months ago by YuriKolovsky.