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Hi All, This is my first post on LAVA, so here it goes: I am creating an application that involves reading data on two RS-422 serial ports. Everything was going just dandy until it was time to build my application into an executable. I've spent time debugging my issue and have been able to narror down where the source of the error is coming from, but I can't figure out why it's happening or how to fixt it. I created a simple VI that clearly demonstrates the error. The VI first configures two serial ports using VISA. It then gets the number of bytes at the port and reads from VISA resource in a loop. Finally the resource refs are closed. Before building into an executable (development mode), everything works fine. When I build this single VI into an executable, there are errors anywhere there is an Instr Propert Node. The error code is -1073807246 (which I can't find anywhere). Does anyone know why I'm having this issue? Is this some sort of dependency issue? Maybe I'm not really including some VISA functions in my dependenices? Serial Read.vi