error trying to configure second interface

error trying to configure second interface

I've set up one router for netflow and it works great. I'm trying to set up a second router and I'm getting the error message "Cannot configure Identical Destination Address and port" - which points back to my system running Netflow Analyzer. This is a Cisco 2651XM running IOS 12.3. Does anyone know why I can't configure the second interface?

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