Is the "C:/.../" part a direct copy/paste or is that were you omitted your actual name/username? If you omitted your username, is there a space in your username? That could be it. 

I'm guessing this has something to do with running the docker in Windows, which is not something we have tested, and I'm not sure I've heard of others doing so either. You might be the first to try it. 

Best,
Chris