This is a late reply and probably of no use, but hopefully it will be of use to someone.
This is a general error that you are not connecting to the VDM and can be caused by multiple things. Make sure all your drivers are up to date, and that you installed properly.
I had this error and it was because VDM was in a special mode. If you go into the about VDM from the icon in the bottom right you can see if you are in this mode (it is bolded and in the centre of the about popup). If you are in this mode, you need to restart the VDM by pressing restart. DO NOT stop and start, you need to restart it without stopping to go into the proper mode.