ROS 2: microxrceddsgen version: null

[AssaX0]

Hello,

currently I am trying to get a Pixhawk6C to raspberrypi4B connection Working.
I am using Ubuntu 22.04 with ROS2 Humble and try to follow the Tutorial:
ROS 2
I followed everything (twice - removed everything and tried again after it did not work) up to the point where you are supposed to check the
"microxrceddsgen -version"
wich returns
"microxrceddsgenversion: null"
I tried fixing it myself, but I am no Linux Main so I asked chat gpt who found a probable typo (?) in:
nano /home/pi/ardu_ws/Micro-XRCE-DDS-Gen/scripts/microxrceddsgen
one Line says
"if ! hash ${jave_exec}; then" what should probably be a:
"if ! hash ${java_exec}; then" ... but after fixing I stil got a
"microxrceddsgen version: null" and chatgpt is not helpfull anymore.

I hope someone can help me fixing this!