BUG: Can't find a SQUASHFS superblock on /root/airootfs.sfs

[JakobGM]

The following error occurs during the docker build.

Saving to: '/root/initial_configuration.sh'

/root/initial_configuration.sh  100%[======================================================>]   3.21K  --.-KB/s    in 0s

2017-09-05 21:20:05 (93.8 MB/s) - '/root/initial_configuration.sh' saved [3291/3291]

Can't find a SQUASHFS superblock on /root/airootfs.sfs
Stopping "docker-vm"...
Machine "docker-vm" was stopped.
Remove our physical harddrive from the boot2docker virtualmachine
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ERROR: The install was not successful please try again.
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[tochelet]

same here