[JSMiles]

I got the same error as well for the registration page

Error! Security check failed for membership level identifier validation.
The submitted membership level data does not match.
If you are using caching please empty the cache data and try again.
If you are using the Form Builder addon, please update the addon and try again.

Your most recent update broke the registration page. Rolling back the plugin to Version 4.1.0 fix the issue. The registration page now works.

[Author]

Posts