Double layer error

Burned a few double layer for testing etc and all burns up till now very good…
NEC 3500AG herrie 2.17 dvd decryptor used…
Always use verbatim and no problems today i tried some traxdata as i had a music double disc both dvd9 that i wanted without compression.
Did disc one with verbatim no problem but disc 2 with traxdata seems to play ok as far as i can see but scanned with nero cd-dvd speed comes up with this error
Seems to be layer break any info would be welcome

Dont matter could not understand why it played behond this point but it does not my mistake…