Audition recording file converted to no sound and no waveform

If anyone can help. I just did a a few voiceover recording session. The recording went fine. But when I try to open the file in Audition the file has no waveform and ther eis no audio. This happened to all the 5 recordign sessions t that were from 30 seconds to 2 minutes.First time this is happening its liek the file was recordied over. First time happening have no idea why Audiotion is acting thios way.