init pzb: null, Error init failed

[Elwag]

I always get this error when trying to make the ramdisk. My command: "sudo ./sshrd.sh 16"
My result:

[*] Getting device info and pwning... this may take a second
img4tool version: 0.197-aca6cf005c94caf135023263cbb5c61a0081804f-RELEASE
Compiled with plist: YES
Saved IM4M to work/IM4M
Version: 3fc8c093f4660f6c6e07c0c9214618733da01ffc - 36
libfragmentzip version: 0.60-120447d0f410dffb49948fa155467fc5d91ca3c8
init pzb: null
Error init failed
[-] An error occurred

Can somebody please help me?
Thanks!