Failed to add HTML header - CFWebstore on CF11

Hello,

I am getting the error below on a new install of CFWebstore v6.6 on CF11. I've used previous release of CFWebstore on CF7 and CF9 without issue. Looking for any suggestions.....

Failed to add HTML header. ColdFusion is unable to add the header you specified to the output stream. This is probably because you have used it to set one of the ColdFusion Session Cookies or Authentication cookie. Please use Application/Server level configuration for this. The error occurred on line 213.

Thanks in advance for any help!

Gary