#1 Error on startup

[Anonymous]

I installed PHPBFE1.5.0alpha1 on a ubunto linux server in a directory named "phpbfe." I set the index.php varaibles for:
$host = 'http://localhost/';
$localrootpath = '/var/www/phpbfe/';
$rootfoldername = 'phpbfe/';

When the program starts, the following error appears:

Warning: opendir(/var/wwwphpbfe/) [function.opendir]: failed to open dir: No such file or directory in /var/www/phpbfe/_core/functions/listdirectories.php on line 12
NOTICE the lack of a / between the www and phpfbe folders names.

Any suggestions?