php error in elxis4 1364

[babis1]

i have that error
[04-Dec-2012 14:41:09] PHP Fatal error:  Class 'elxisConfig' not found in /includes/libraries/elxis/defender.class.php on line 59

[datahell]

It seems you have something wrong with your multi-sites setup or there is something wrong in configuration.php
You are using multi-sites, right?

[babis1]

no i don't use multisites but i have to check the configuration
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configuration is ok, maybe something wrong at the installation, i wait to see if that error comes again