Unable to jump to row 0?

[Exilo]

Hello guys, after getting UberCMS, I get this MYSQL erro on the homepage on the top:

Warning: mysql_result() [

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]: Unable to jump to row 0 on MySQL result index 17 in C:\xampp\htdocs\includes\class.core.php on line 191

Well, I am not a good one to fix errors like this, so, any help?

-Alex