Page Builder CK Captcha

I have Page Builder CK and I get the following message, "You have enabled the captcha but it can not be loaded. Check in your website configuration that you have enabled it."
In my Global configuration it states  Default Captcha > None Selected.  In the dropdown there is none to choose.  
Is this the Captcha the Page Builder uses?
If so, do I need to download one?  If so, which one?

In  Community Builder this is handled by an anit-spam Field.

We're not the developers of Page Builder CK. Please contact them regarding issues in their extension.

CBs captcha does not apply outside of CB unless you're using the CB AntiSpam Joomla captcha plugin and have configured Joomla captcha mode to CB AntiSpam. Globally you said it's already set to None so there's nothing CB AntiSpam could be doing there.