If you see this message, it means you have a plugin trying to add a Sidebar to a page. Because of Weaver II's flexible sidebar layouts, Weaver standard sidebar areas are not compatible with this plugin, but this special one is. To use this area, open the Main Options : Widget Areas : Define Per Page Widget Areas and define a per-page area called plugin_replacement. Add widgets to the new plugin_replacement area, and they will be displayed here on plugin pages. If you do not add any widgets, then nothing will be displayed, and this message will go away.