Failed to connect to the King Phisher RPC Service

[charlyrock]

Issue Description

I experience an issue when I... and the results I expected are...
Installed King Phisher

Reproduction Steps

1. Start King Phisher
2. Login with local credentials
3. Click Connect
4. Get Failure: Failed to connect to the King Phisher RPC Service

Environment Details

Host OS: Ubuntu 20.04
King Phisher Version: 1.15.0

Error Details / Stack Trace

AdvancedHTTPServer         WARNING    serializer failed to load data
AdvancecHTTPServer          WARNING    127.0.0.1 code 400, message Invalid Data

I don´t found any solution actually.
Postgres Service is running (Port 5432)
Port 80 is running (Python)
Port 22 is running (SSHD)
Port 631 is running (cupsd)

Have you any idea, which is my failure?
Thank you