I installed the update site in Designer, but when I put the control on a page I get this. I tried to rebuild/clean but without success.

Description    Resource    Path    Location    Type
The project was not built since its build path is incomplete. Cannot find the class file for com.ibm.xsp.extlib.component.layout.UIApplicationLayout. Fix the build path then try building this project    ExtendedAppLayout.nsf        Unknown    Java Problem