Titleset Does Not Exist

I am new to this and apoligise if this question has been asked before. I did do a search without any success.

I am using 1 Click DVD with AnyDVD which has worked fine for backing up DVDs until recently. The problem has arisen with the copper coloured discs and about 40% through the process the process stops with the message " Titleset does not exist"

Any suggestions on how to get over this?