Add RDM using power shell

Hi,

I am trying to add RDMs to a virtual machine using script.

This RDM was added via GUI (vSphere Client) before with out issues and also removed with out removing mapping file (.vmdk).

PowerCLI>  New-HardDisk -VM VM02 -DiskPath "[OS_02] VM02/VM02_1.vmdk"

I am getting error Incompatible device backing specified for device '0'

New-HardDisk : 15:39:13    New-HardDisk        Incompatible device backing specified for device '0'.

Thanks..