What does it mean if I get this message "Error while extracting data: No signature found!" #johntheripper #bitlocker2john

[third3ye003]

I am referring to OpenCL to crack my bitlocker password --> https://openwall.info/wiki/john/OpenCL-BitLocker
There was a bitlocker on all my drives and no recovery keys were to be found on my MS account. I had basically no access to my system so...

Here's what I have done so far:

• I recovered my PC running on Windows 10 using USB. This step reinstalled my OS.
• I created disk image of the encrypted drive
• I ran the bitcracker john the ripper. After running for several hours I get this message "Error while extracting data: No signature found!"

Please help. Let me know if you need more info