Error got with ocilogon on PHP5 using Apache 2

I got the error below when i was trying to connect to my Oracle8i. I used  the function ocilogon() of the PHP5. Someone can help me to solve this problem?
Since now, Thank's a lot

Warning: ocilogon() [function.ocilogon]: OCISessionBegin: ORA-24327: need explicit attach before
authenticating a user
 in C:\Arquivos de programas\Apache Group\Apache2\htdocs\supplier\biblioteca\classes\DataAcess\DataAcess.php on line 8
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