BackupEventlog method returns error 3????

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Hi,

When invoking the BackupEventlog method the retuen values as documnated in
the wmi sdk are as listed bellow but I receive a return code of 3 which is
undocumanted:
Return code Description
0 Success
8 Privilege missing
21 Invalid parameter
183 Archive file name already exists


private void wmiEventLog_System()

{

SelectQuery strQuery = new SelectQuery("SELECT * FROM Win32_NTEventLogFile
where LogFileName='System'");

ManagementObjectSearcher oSearcher = new ManagementObjectSearcher(ms,
strQuery);

ManagementObjectCollection oCollection = null;

oCollection = oSearcher.Get();

UInt32 rc = 0;


foreach(ManagementObject item in oCollection)

{

try

{

object[] methodArgs = new object[] {path + file + "\\EventLog_System.evt"};

rc = (UInt32)((ManagementObject)item).InvokeMethod("BackupEventLog",
methodArgs);

}

catch (Exception exp)

//catch (ManagementException exp)

{

Debugger.Log(10, "bug", exp.Message);

log.WriteLine(Global.TS() + Global.LogName(name) + "wmiEventLog_System: " +
exp.Message);

log.Flush();

}

}

}