Its clear that paths are not set right.
Did you try an uninstall / reinstall of onkyo?
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no, I didn’t, but it was actually a clean basic installation with a clean installation of the script with this lines
but i will set up a completely new system with pimtaic for testingsudo apt install python3-pip
pip3 install https://github.com/miracle2k/onkyo-eiscp/tarball/master
export PATH=${PATH}:/home/pi/.local/bin
onkyo --discover
TX-NR626 192.168.1.234:60128