# Instrument Control (GPIB, Serial, VISA, IVI)

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## nationalInstruments.common.dll 8.6.20 needed

I am working on a project which have been developed by the others , I met a problem with the nationalInstruments.common.dll .

The type 'NationalInstruments.ComponentBase' is defined in an assembly that is not referenced. You must add a reference to assembly 'NationalInstruments.Common, Version=8.6.20.131, Culture=neutral, PublicKeyToken=4544464cdeaab541'.

so I think I need the right dll version to complete my work , can any one tell me where to find it?

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## Re: nationalInstruments.common.dll 8.6.20 needed

I think you need to install MeasurementStudio as discussed in http://digital.ni.com/public.nsf/allkb/46DE00265283A71586256FC000797682

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