Camcorder DVD to Vegas Movie won't import

Got Vegas Movie based on recommendation from this site. Excellent! Slowly learning how to use it. Have Sony DVD/RW camcorder. Discs from camcorder play fine in the computer. Tried to import the camcorder files into Vegas using
file/import/dvd camcorder disc. No go; computer tells me no disc in the drive even though it just played it with dvd player. Any suggestions? thanks in advance for any help