Error message “please control the email adress”

Hi,

every time when I try to make a comment as a visitor without account registration on my own page I get the error that the email doesn′t exist.
I was trying using different emails which definitely exist but all the time the error message in the right top corner.
I have to deactivate the cleantalk plugin in order to send the comment and after that I have to activate the plugin again.

Please fix the problem or give the users the opportunity to turn this feature off. It is not working correctly.