Prusa i3 MK3 Connection Problem

What is the problem?
I have installed the OctoPi on a Raspberry Pi 3 B+ like this tutorial:

Then i have wired like this pictures:
I can see the Serial Connection and i put this. I set the baudrate to 115200.
But i get an Error in the connection

What did you already try to solve it?
Search in all Forums.
Check the wires.
Reinstall all.

Logs (octoprint.log, serial.log or output on terminal tab at a minimum, browser error console if UI issue ... no logs, no support!)

serial.log (1.9 KB)
octoprint.log (186.6 KB)

Additional information about your setup (OctoPrint version, OctoPi version, printer, firmware, browser, operating system, ... as much data as possible)

OctoPrint version : 1.4.0
OctoPi version : 0.17.0

Firmware 3.8.1