Hello abrambos,
Can you show me screenshot of this error? Also please run conflict test for all other plugins and theme – it is possible that there is some validation script that should not be there.
Testing for Theme conflicts
To rule out a theme conflict, you’ll first need to temporarily activate a WordPress default (stock) theme like Twenty Fifteen. Then clear your browser cache and any other caching running in your admin.
Test your issue again, and if it no longer exists, you have a theme conflict.
Testing for Plugin conflicts
If you’ve already ruled out a theme conflict, next you’ll need to check for plugin conflicts.
While a WordPress PopUp is still active, next deactivate all other plugins except for ours.
Test your issue once again, and if it no longer exists, you have a plugin conflict. To determine which plugin is conflicting, re-activate plugins one by one while testing to see if the issue returns after each activation. When the issue returns you’ve found the conflicting plugin.
I’m testing plugin on my site and I cannot replicate this issue.
kind regards,
Kasia
