Hello and welcome to the forum,
Sometimes you can get this error when the burner does not have great compatibility with a disk. Sometimes you get the error sometimes not. (what I mean is sometimes it does not truly indicate that the cd burner is dirty, it just cannot communicate correctly with the inserted disk)
Give you burner the best conditions in which to work:
(new cable with I imagine you have and well connected)
good media (you might need to try various brands)
and low burning speeds
What is different when you use your burner with other software? do you burn CD instead of DVDs? Are you using RW media with ConvertXtoDVD?
Feel free to post a log file here, it may help us see what is going on.