Unable to create spanshots

[bob]

I am unable to create snapshots successfully (using the management 
console site), even as the admin account, why?

Apache Cloud Stack 4.4.2
Failed to create snapshot due to an internal error creating snapshot for 
volume 76.

Storage Volume Details:
State: Ready
Type: DATADISK
Storage Type: shared
Hypervisor: KVM
Size: 20GB
VM ID: detached
Storage: primary1
Domain: ROOT
Account: admin