Can't adjust Page Layout in Panel Wizard

Hello everyone, I tried to use the Panel Wizard to change the Page Layout from the default setting of "Right Column" to "Left Column". When I clicked "Save the new layout" I received a prompt "The layout has been saved properly". However, a stack trace was written to the console. I am now left with no side columns at all. What am I doing wrong? Here's the message that is now written to the console when I navigate to the Panel Wizard page. 16:22:30,727 ERROR P1-18 http://localhost:8080/xwiki/bin/view/Panels/PanelWizard?forceLeftPanels=1&a… SimpleLog4JLogSystem:logVelocityMessage:154 - Left side ($first) of '==' operation has null value. If a reference, it may not be in the context. Operation not possible. Panels.PanelWizard [line 6, column 14] 16:22:30,747 ERROR P1-18 http://localhost:8080/xwiki/bin/view/Panels/PanelWizard?forceLeftPanels=1&a… SimpleLog4JLogSystem:logVelocityMessage:154 - Left side ($first) of '==' operation has null value. If a reference, it may not be in the context. Operation not possible. Panels.PanelWizard [line 6, column 14] 16:22:30,747 ERROR P1-18 http://localhost:8080/xwiki/bin/view/Panels/PanelWizard?forceLeftPanels=1&a… SimpleLog4JLogSystem:logVelocityMessage:154 - Left side ($first) of '==' operation has null value. If a reference, it may not be in the context. Operation not possible. Panels.PanelWizard [line 6, column 14] I have installed xwiki-enterprise-1.1-milestone-3 on a Windows XP machine. For now, I'm using the default HSQL database and Jetty web server. Regards, Justin Robbins