关于ChangePassword请大家帮忙，看看为什么会有这样的错误？

[superykai]

想用户可以改变自己的网络密码，但出现The Active Directory property cannot be found in the cache. 错误，到MSDN找了几天，没发现解决办法，请大家看看以下的程序：
//change password
public string ChangePassword(string username,string oldpwd,string newpwd)
{
string return_msm="";
string _path="LDAP://"+ domain;
string domainAndUsername = domain + @"\" + username;
DirectoryEntry entry = new DirectoryEntry( _path,
domainAndUsername,
oldpwd);

try
{

entry.Invoke("ChangePassword", new Object[] {oldpwd,newpwd});
entry.CommitChanges();
entry.RefreshCache();
return_msm = "OK";

}
catch (Exception ex)
{
return_msm=ex.Message;
}

return return_msm;
}

[saucer]

take a look at

http://support.microsoft.com/default.aspx?scid=kb;en-us;251189

[superykai]

Thanks Saucer for helping, I did read that article, but not quite understand, I checked local computer's registry, there are Time and File name and value in HKEY_LOCAL_MACHINE\SOFTWAR\Microsoft\ADs\Providers\LDAP\CN=Aggregation,CN=Schema..., that article mention three probably reason might cause problem, but how can I know which one is? Thanks again.

kai