administrator blank page after install...!

Hello,

we just installed easyblog on our intranet, to test it...but...when we login into our administrator account, we have a blank page with this error :

Warning: require_once(/var/www/intranet/components/com_easyblog/constants.php): failed to open stream: No such file or directory in /var/www/intranet/components/com_easyblog/helpers/helper.php on line 22 Fatal error: require_once(): Failed opening required '/var/www/intranet/components/com_easyblog/constants.php' (include_path='.:/usr/share/php:/usr/share/pear') in /var/www/intranet/components/com_easyblog/helpers/helper.php on line 22 

What can we do to fix this ?

Regard.