• I found the problem! In VSTA I had referrenced version 10.50.1600.1 of the AnalysisServices.dll. My SSIS server is version 2012 so it has version 11.0.3000.0 of the AnalysisServices.dll installed but not version 10.50.1600.1. I changed the reference to version 11.0.3000.0 in VSTA, deployed my package to the SSIS server and it ran successfully.

    Chris.