I have this issue with Emulating#16

Running Dev Operating System. cd ./sdk && sudo ./diskimage.sh Formatting 'c.img', fmt=raw size=2097152 Device contains neither a valid DOS partition table, nor Sun, SGI or OSF disklabel Building a new DOS disklabel with disk identifier 0x1d94e7f8. Changes will remain in memory only, until you decide to write them. After that, of course, the previous content won't be recoverable. Warning: invalid flag 0x0000 of partition table 4 will be corrected by w(rite) You must set cylinders. You can do this from the extra functions menu. Command (m for help): Expert command (m for help): Number of cylinders (1-1048576): Expert command (m for help): Number of heads (1-256, default 255): Expert command (m for help): Number of sectors (1-63, default 63): Expert command (m for help): Command (m for help): Partition type: p primary (0 primary, 0 extended, 4 free) e extended Select (default p): Partition number (1-4, default 1): First sector (1-4095, default 1): Last sector, +sectors or +size{K,M,G} (1-4095, default 4095): Command (m for help): Partition number (1-4): Command (m for help): The partition table has been altered! Syncing disks. Disk ./c.img: 2 MB, 2097152 bytes 1 heads, 5 sectors/track, 819 cylinders, total 4096 sectors Units = sectors of 1 \* 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x1d94e7f8 Device Boot Start End Blocks Id System ./c.img1 \* 1 4 2 83 Linux /dev/loop1: No such file or directory mke2fs 1.42.9 (4-Feb-2014) Could not stat /dev/loop1 --- No such file or directory The device apparently does not exist; did you specify it correctly? mount: permission denied umount: /mnt/: must be superuser to umount ``` [ Minimal BASH-like line editing is supported. For the first word, TAB lists possible command completions. Anywhere else TAB lists the possible completions of a device/filename. ] ``` grub> device (hd0) ./c.img grub> geometry (hd0) 4 16 63 drive 0x80: C/H/S = 4/16/63, The number of sectors = 4032, ./c.img Partition num: 0, Filesystem type unknown, partition type 0x83 grub> root (hd0,0) grub> setup (hd0) Error 17: Cannot mount selected partition grub> quit loop: can't delete device /dev/loop1: No such file or directory make: **\* [emulate] Error 1