Image cloning stuck in locked state

Please, describe the problem here and provide additional information below (if applicable) …
I uploaded a centos ISO as a CD-ROM image and when I try to clone the image, the new image stays in locked state for ever. Basically cloning of image stays in lock state for ever. I tried with several ISOs, data-block and installed image.
Also Its a fresh installed opennebula Frontend. There is no VMs running at the moment ,including the templates.

Versions of the related components and OS (frontend, hypervisors, VMs):
Opennebula version - 5.2
KVM Hyperver
Hypervisor and Frontend OS is - Ubuntu 16.04

Steps to reproduce:

Current results:
Image in Locked state forever

Expected results: