burp-ui not working

[otwieracz]

[root@pioneer:~]# burp-ui
 * Serving Flask app "burpui.cli"
 * Environment: production
   WARNING: This is a development server. Do not use it in a production deployment.
   Use a production WSGI server instead.
 * Debug mode: off
Usage: flask run [OPTIONS]

Error: Could not import "burpui.cli".