ActiveX Script Task] Error in SSIS

Hi,
I'm trying to reset the below Global varialbe in SSIS - Activex script.

Function Main()
DTSGlobalVariables("GxvFilename").value =null
Main = DTSTaskExecResult_Success
End Function

Getting the below Error when executing the package.

[ActiveX Script Task] Error: Retrieving the file name for a component failed with error code 0x060339E4


Please provide me solution for this.

Thanks,

No Worry,
I found solution my self after with more test.
The solution is the Activex Script not working as like SQL 2000. We nee to use " " instead of null for resting the global variables.
MS need to give some reasonable error message for this kind of error.
Good luck