Thought i knew about dvd decryptor but oviously not.

Trying to help a friend.
Using dvd decryptor latest version for collateral damage.
default settings used.
getting this error message.

i/o error
device:[1:1:0]atapi dvd-rom 16x 921a (d
scsi status 0x02
CDB: 28 00 00 0f 6b 13 00 00 01 00
Interpretation: Read (10) - Sector : 1010451
Sense area: 70 00 05 00 00 00 00 0a 00 00 00 00 64 00
Interpretation : Illegal mode for this track.

This disc is read with dvd decryptor/smartripper successfully on another pc.

I have never seen this before so I would really appreciate some pointers.
Is this a problem between the software and dvd rom's compatibility?
If so is there a fix for it.
Any guidance would be hailed as extreme happiness.