Why the VHD file is always shows error?

This is a 2-host MS HyperV 2012 setup, with 8 VMs within. Both hosts are sharing the same SAN Storage, and 2 volumes were created in paths - c:\clusterstorage\volume1 and volume2, respectively. However, whenever I tried to move some of the the VHD (or VHDX) files to different volume or host, the error occurs as attached.

I just took over the administration of the above virtualization setup. I not sure whether this is because both volumes are not CSV, but, does it mean that both volumes have to be converted to be CSV (Clustered Storage Volume)? I check the host resources are enough, what else?

Thanks first, hope you guys could be any help.
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