You need to have one template per sites (it you want the same, I advice you to duplicate it with a different template name). Then from the admin section, use the "Template Selector" in order to choose which template you want to change the sidebox layout for, and then, go in the sidebox layout and move the sidebox for the selected template.

I have never seen before this error in categories, I'll try to contact you in PV in order to get more information about your configuration...