Q: Disk Utility image fails to mount, Unable to attach ( no mountable file systems )

Hi



i was traveling in EUROPE and my screen was going black, i took my MBP to a apple center in France and discovered the CPU had to be replaced, i was covered but i had to back up all the files and i was advised to try using disk utility to create an image and restore it later, 

I successfully did this but Sadly after taking the macbook pro back to the hotel then on a plane i tried to restore the image from my external HD and i keep getting this message! :

"DISK UTILITY PROGRESS"

Unable to attach APPLE SSD SD56E Media.dmg ( no mountable file systems )


Can anyone tell me if there is a way to access the files on this image at all, its on another HD i use for filming?



Really appreciate it!