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I have a new WP install with ONLY Meta Box and AIO plugins installed. I created a simple CPT called attendee. I then created 2 custom fields for 'First Name', 'Last Name' in a field group assigned to Attendee. So far, simple. It works as a CPT and I can enter in first/last name info. I added the shortcode, as created by Meta Box, to a test page and tried to update the page, but I always get:
Updating failed. The response is not a valid JSON response
If I capitalize the first letter of the ID, the save works, but naturally when you view the page in the front end, it is just a title and content, no custom fields because the field group name did not match exactly. But when it does match, you can't save the page. Here is the shortcode I am trying to use:
[mb_frontend_form id="attendee_group" post_fields="title,content"]
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