Need Help with ASR and Deploying InstaDMG BaseOS and packages

Hi, EDIT: I'm having a problem that has to do with my InstaDMG build process. The first time I made an InstaDMG image, it took a good long while to make the image (about an hour). Now, it's less than a minute and it claims to be done. When it starts, the log shows the following: "hdiutil: mount failed - not recognized". I wonder am I doing something wrong? When I attempted to run InstaDMG, I typed in "cd", then space, then dragged the InstaDMG folder into the terminal window and pressed return. Then I typed "sudo ./instadmg.bash" and pressed return. It asked for a password, and I typed that in.