When flashing 6.0 stock image receive error "missing package system.img"

Here is the problem. I accidentally deleted everything on my Nexus, so now I have no operating system. I am trying to flash stock android 6.0 and I recieve the error "package missing system.img". My phone was already running Marshmallow, and I had no problems installing it the first time, so I am not quite sure why this is happening now.