Another menu item with the same parent has this alias Error bu

During install of an update for mobile joomla this message apears:

Another menu item with the same parent has this alias  Error building Admin Menus

Tried several tims to reinstall also after uninstall.

Trying to install on latest joomla version 2.5

Very frustrating. Does anyone knows why this cold happen?

Thnaks,
Ronald

Try this thread: forum.joomla.org/viewtopic.php?p=2406137