setup_singularity.sh does not work

Following the instructions of the "Complete installation" didn't work for me:

mduran@cervantes:~$ sh setup_chemicalchecker.sh
false
true
 SUCCESS: Chemical Checker local directory available. (/home/mduran/local_checker) 
Identity added: /dev/fd/63 (interactome3d@irbbarcelona.org)
 SUCCESS: def file cloned. 
Removing old singularity image...
rm: cannot remove '/home/mduran/local_checker/cc.simg': No such file or directory
Creating singularity sandbox image... 
ERROR: /home/mduran/local_checker/sandbox is not an image file
Cleaning up...
 ERROR: creating sandbox image.