MeloTTS error with verbi

The API endpoint for MeloTTS starts correctly, but gives following error when running from Verbi:
 > ===========================
  0%|                                                     | 0/1 [00:00<?, ?it/s]
INFO:     127.0.0.1:53830 - "POST /generate-audio/ HTTP/1.1" 500 Internal Server Error
^CINFO:     Shutting down
INFO:     Waiting for application shutdown.


How can I fix this? Thanks