What does the error message "Can not read the selected audio stream. Please try other formats!" mean?

The error means DVD Audio Extractor has difficulty locating the audio stream you selected. There are several possibilities:

In case this happened, first please select other available formats on the disc and try again. If still failed, run a DVD Copy software and get a copy of the disc onto your hard disk. Then run DVD Audio Extractor in "Browse to file folder" mode. If still get the same error, then there must be an error in the IFO files. Please open the VOB files and extract one by one as a workaround.