Project References: ASP.DLL and MTXAS.DLL
Dim mResponse as Response
Dim mContext as ObjectContext
Sub WriteASP()
    Set mContext  = GetObjectContext()
    Set mResponse = mContext("Response")
    mResponse.Write "HELLO"
End Sub

I also did then <Implements ObjectControl> and Activate, Deactivate and
CanBePooled.
When the code get to: Set mResponse = mContext("Response"), that's where I
got the error as above heading.

Any suggestion?

Thanks
Thai Vuong