[Error Reading Disc: Failed to get disc capacity!]

I have a DVD I purchased that won't play in a DVD Player. When I try and read it with either DVD Decrypter or IMGBurn I get a similar error "Failed to get disc capacity!"

 

Here is the info I can get on the disc:

HL-DT-ST DVD-RAM GH22LP20 1.02 (ATA)
Current Profile: DVD-ROM

Disc Information:
Status: Complete
State of Last Session: Complete
Erasable: No
Sessions: 1

Physical Format Information (Last Recorded):
Book Type: DVD-ROM
Part Version: 1
Disc Size: 120mm
Maximum Read Rate: 10.08Mbps
Number of Layers: 1
Track Path: Parallel Track Path (PTP)
Linear Density: 0.267 um/bit
Track Density: 0.74 um/track
First Physical Sector of Data Area: 196,608
Last Physical Sector of Data Area: 1,380,095
Last Physical Sector in Layer 0: 0

 

Any suggestions?

 

thanks,

beardboy