[Serusers] Problem with serweb...

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Hello
When i open serweb with IE , it always show this error message:
Function aggregate_methods() doesn't exists. Try install Classkit extension. http://pecl.php.net/package/classkit
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But i have install classkit , and i have set extension=classkit.so in php.ini
and the problem still exist. why??
my system is FC4 httpd-2.0.54-10.2 + php-5.0.4-10.5 
[root at 15 ~]# pear list
Installed packages:
===================
Package              Version State
Archive_Tar          1.1     stable
Console_Getopt       1.2     stable
DB                   1.7.6   stable
HTML_Template_IT     1.1     stable
HTTP                 1.3.5   stable
Mail                 1.1.4   stable
Net_SMTP             1.2.6   stable
Net_Socket           1.0.6   stable
Net_UserAgent_Detect 2.0.1   stable
PEAR                 1.3.5   stable
XML_Parser           1.2.6   stable
XML_RPC              1.4.0   stable
classkit             0.4     beta
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