[SOLVED] Error after install...

I received this error when I try to access the component in admin.
Fatal error: Cannot make static method JToolBarHelper::addNew() non static in class mosMenuBar in /var/www/training/administrator/components/com_uddeim/admin.uddeimlib15.php on line 27

I get this error in frontend:
Fatal error: Call to undefined method JLanguage::getBackwardLang() in /var/www/training/components/com_uddeim/uddeimlib15.php on line 174

I installed the 2.5 beta and my joomla is 1.7

What may be the problem?

Are you sure that you have 2.5b installed? It seems that in "toolbar.uddeim.php" the wrong library is loaded. This is a first time report so I think it is something with your installation.

Please try to redownload the uddeIM package from my dev site and do a clean install. You should also try to install it on a fresh Joomla setup.

Sorry!

I had by mistake installed the older 2.4 version, now it works!

Very sorry for this!