IdleFW tried to load old UI controller, because of wrong value in Cenrep. Ui controller loading failed ( KErrNotFound ), because the dlls were missing which the plug-in links against.
<layer name="homescreensrv">
<module name="group_homescreensrv">
<component name="group_homescreensrv">
<unit unitID="homescreensrv" mrp="" bldFile="&layer_real_source_path;\group" name="homescreensrv" />
</component>
</module>
</layer>