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I have not used ComosXpress, but use CosmosWorks Designer (static FEA) as part of my SolidWorks Office Premium license.
Have you assigned material properties to the part, and have you created a mesh before running the analysis?
While using Solidworks simulationXpress, it will not support multiple solidbodies with in a part. Try to suppress sharp fillets etc. If possible save the part, then use simulaitonXpess, while using simulaitonXpress unselect the Solidworks Simulation form the Add-inn options if you are having Solidworks Simulation product.