Funkcija izbacuje grešku

Pozdrav!

dali neko zna što mi ova funkcija izbacuje grešku i kako da napravim?

greska je

<b>Warning</b>:  mysql_data_seek() [<a href='function.mysql-data-seek'>function.mysql-data-seek</a>]: Offset 7 is invalid for MySQL result index 4 (or the query data is unbuffered) in <b>D:\xampp\htdocs\a.php</b> on line <b>30</b>

[php]if (mysql_num_rows ($sql) > 0)
{
// data_seek
}
else
{
// nema rezultata
} [/php]

I think that should work


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