Tunnel-monitor example not working properly

Hi guys,

I am trying to get the tunnel-monitor example working on my linux VM. I built bcc from source, but when I try to run main.py, it says "fail class NoneType" when the hosts are being launched. Can anyone help plz? Thanks in advance!

Start with the tunnel-monitor example and its main.py entry point on a Linux VM, then reproduce the reported “fail class NoneType” message while hosts are launched. Review the example’s documented or required runtime context against the source build; done means the example launches without that error.

Written by the indexing model from the issue text.