Angstrom can't show anything upon login

“the configuration defaults for gnome power manager have not been installed correctly” message is shown after the login from the Angstrom OS that is included inside the sd card. The screen will show the desktop wallpaper but it just stuck there.After updates and upgrade also does not seem to solve the problem. As i search through the internet, for ubuntu, they are using “sudo apt-get clean” to solve the problem but it seems like in the Angstrom “opkg clean” is not one of the package. Can anyone helps on this matter?