exporter can't get metrics from socket

Hello, if i run ./fail2ban-prometheus-exporter -socket /var/run/fail2ban/fail2ban.sock -port 9191 i get the following output:

2021/12/18 00:50:50 starting fail2ban exporter at 0.0.0.0:9191
2021/12/18 00:50:50 metrics available at '/metrics'
2021/12/18 00:50:50 ready
2021/12/18 00:51:03 failed to get stats for jail plesk-modsecurity: class not found: __builtin__ : str
2021/12/18 00:51:03 failed to get stats for jail recidive: class not found: __builtin__ : str

I use Plesk on my VPS and there is another fail2ban.sock. If i run ./fail2ban-prometheus-exporter -socket /run/fail2ban/fail2ban.sock -port 9191 i get the same output.

Any ideas what the problem could be?

System: Debian 10