What does this error mean?

[efc1978]

Hello,

Tried to burn a dual layer DVD tonight and got this error:

http://postimg.org/image/hov5c8a27/

Does anyone know what it means, and how I fix it?

Thanks in advance!

[efc1978]

Sorry left out some details I could have provided.

It burned with 2 write retries.

This error came about 75% through verify, got to a whole lot of read errors and cancelled as it was getting nowhere....

Thanks again.

[LIGHTNING UK!]

Post the log please.