This thread is resolved. Here is a description of the problem and solution.
Problem:
The issue here is that the customer was unable to add new customer fields using Types to his custom post types.
Solution:
This issue was being caused by a modsecurity block, so if you are experiencing this issue I would recommend getting in touch with your hosting provider and check if the action is being blocked by the server.
This support ticket is created 7 years, 10 months ago. There's a good chance that you are reading advice that it now obsolete.
This is the technical support forum for Toolset - a suite of plugins for developing WordPress sites without writing PHP.
Everyone can read this forum, but only Toolset clients can post in it. Toolset support works 6 days per week, 19 hours per day.
Howveer it does not do anything when I click the button, locally I have jo issue but online it does not work, plus, if I try too many times my server blocks me. mod_security
The issue however still exists. I am sure it is aserver related configuration, but, what? Also when I create that field on my local machine it will not import, perhaps you could see if you are able to import a new form field.