X-vector are not created

I follow all the step and try to work with the flac example
but in /data/ folder the files are 0 bytes and no I didn't get the feat dir

bash enroll.sh ./wav/38-121024-0002.flac 1
1: without speaker

get utt2spk, DataPre start on Wed Oct 16 22:18:29 IDT 2019

===== data preparatin finished successfully Wed Oct 16 22:18:29 IDT 2019==========

sorted spk2utt ... : fix_data_dir start on Wed Oct 16 22:18:29 IDT 2019

fix_data_dir.sh: no utterances remained: not proceeding further.

[Hertin]

You should use ./wav instead of ./wav/38-121024-0002.flac
Also, try to use .wav instead of .flac