EBR in Joomla 2.5.6

Ich spreche nicht zo gut Deutsch, so I continue in English. I hope it's no problem.
When installing EBR in Joomla 2.5, I get some errors. Nothing is installed, nothing to see in the component menu.
These are the errors:
- Another menu-item from the same mainmenu uses this alias
- Error during creating admin menu's
- Component installing: DB function rappors no errors

- Error by installing component

I had EBR in Joomla 1.5, but I removed the component, alo from the database end the menu.

Please help me!