We have included the articles side bar component in our case feed layout page in our trial org and later created 2 sandboxes from it. I'm getting the following error for articles sidebar component in one of the sandbox while in the other the same configuration ins working fine. There is no change in the configuration and the layout is a case feed layout. Any ideas why this behaviour?

Recently our sandboxes got upgraded to Winter 15.

We have included the articles side bar component in our case feed layout page in our trial org and later created 2 sandboxes from it. I'm getting the following error for articles sidebar component in one of the sandbox while in the other the same configuration ins working fine. There is no change in the configuration and the layout is a case feed layout. Any ideas why this behaviour?

Recently our sandboxes got upgraded to Winter 15.