Problems when launching demo.py

[vincent-26]

I'm following the installation training step by step but when I run demo.py gives me back:
/home/ubuntu/Scrivania/FCIS/fcis/config/config.py:173: YAMLLoadWarning: calling yaml.load() without Loader=... is deprecated, as the default Loader is unsafe. Please read https://msg.pyyaml.org/load for full details.
exp_config = edict(yaml.load(f))
Istruzione non consentita (core dump creato)

How can I fix this?