After meditating and putting on my aluminum foil telepathy hat I have come up with: He's trying to use that command line to start his minecraft server on Win 7 and probably does not have a batch file or has an error in it. I also am getting the vibe that he has not gone to
viewtopic.php?f=10&t=140579 for server setup. I also sense a disturbance in the Force but that could just be that burrito I ate.