Voice Memos Mac

Dera all,

I have recorded few interviews via Voice memos on my mac.

Unfortunately it is seems I cannot listen to them.

The recordings are listed on the left table and they indicate the length, but when clicking play the it seems the recording is empty (see attached pic). I in fact cannot drag them on the desktop.

Anyone that had the same problem and that can help me understand how to recover them?

Many thanks in advance