I added Knowledge Articles to our Site.com site using a Data repeater. When Guest Users and Customer Community Users view our Site.com website, they can't see the articles and get the following error: "We're unable to retrieve your data due to an error".

Guest Users and Customer Community Users are able to access Custom Objects.

Relevant Community User and Guest User Profile Settings:
Tab Settings - Knowledge - Default On
General User Permissions - Knowledge One - Checked
Article Type Permissions - Site Content Articles - Basic Access - Read - Checked

How can I enable Guest Users and Customer Community User to view Knowledge Articles in Site.com?