Datasmith may be in beta but it doesn’t really work all that well yet. I really hope they fix this. I have attached my bug report and I hope all of you with issues do the same. This way the issue seems more important. I know the datasmith would be the greatest thing in the world to me if it worked like it was supposed to. Also, it will not work fully, but the issue you seem to be having is that your assembly file is not in the same directory as your parts. This plugin doesn’t work with server assemblies.