Please check if it is caused by the following reasons.
- The virtual disk is not a RAM-disk, but a hybrid-disk or a file-disk.
- The drive letter of the virtual disk is A or B.
- The page file size exceeds the free space on the virtual hard disk.
- Primo Ramdisk is not updated to the latest version.
If the type of the virtual disk is Direct-IO, try the SCSI type.