Cannot add RDMs to virtual machines using NetApp SnapDrive (1029963) Snapdrive sees the LUN and falls over with server sent an invalid request. Vmware sees the RDM and gives it a LUN ID and falls over with server recieved an invalid request. Any idea?

Bit of a strange one I've checked the NetApp storage. Volume is created. Add in snapdrive creates the LUN and then falls over. Vmware sees RDM and has lun id but won't add the disk. Any ideas? Sorry my first time on the forum but hoping to learn and share.