Virtual Machine on HyperV unable to start

VM failed to start.

Synthetic SCSI Controller (Instance ID 9B0AB811-A860-4423-9331-38327D3A12A7): Failed to Power on with Error 'The requested operation could not be completed due to a virtual disk system limitation.  Virtual hard disk files must be uncompressed and unencrypted and must not be sparse.'.

Attachment 'D:\Virtual Harddrives\MAINSERVER1\6c6b2a99_Virtual_Disk______8788B6DA-96A2-4970-B921-BA2F898CDC06.avhdx' failed to open because of error: 'The requested operation could not be completed due to a virtual disk system limitation.  Virtual hard disk files must be uncompressed and unencrypted and must not be sparse.'.

'MAINSERVER1' Synthetic SCSI Controller (Instance ID 9B0AB811-A860-4423-9331-38327D3A12A7): Failed to Power on with Error 'The requested operation could not be completed due to a virtual disk system limitation.  Virtual hard disk files must be uncompressed and unencrypted and must not be sparse.' (0xC03A001A). (Virtual machine ID A59DD187-1E8E-4C46-A40E-4AB8C6B20730)

'MAINSERVER1': Attachment 'D:\Virtual Harddrives\MAINSERVER1\6c6b2a99_Virtual_Disk______8788B6DA-96A2-4970-B921-BA2F898CDC06.avhdx' failed to open because of error: 'The requested operation could not be completed due to a virtual disk system limitation.  Virtual hard disk files must be uncompressed and unencrypted and must not be sparse.' (0xC03A001A). (Virtual machine ID A59DD187-1E8E-4C46-A40E-4AB8C6B20730)