theChris1310:
after 2 Minutes I got this Message in the Terminal:
Well at least it's more information. Unfortunately it doesn't give me any brainstorms for a solution.
theChris1310:
should I link the Topic to github als well?
There is actually already an issue that looks like the same thing:
There is a bit more to their error message but I think the important part is the same. The "invalid library" part of that error is unrelated to the problem. I ended up locking that issue because the person who submitted it was bumping it, which is not cool when it causes 800 people to get an email, but if you end up with more information to add to it let me know here and I'll unlock it.
I know the Arduino IDE does some network stuff on startup. There is some of that for checking for IDE, library, and boards updates but also I think it does some stuff for network ports for certain boards. The latter was somewhat recent so you could try rolling back through IDE versions until you find one that works. Of course it's best to figure out how to get the latest version working but pinpointing exactly which IDE version the breakage starts at can provide a valuable clue to the cause. You might also try the beta build to see if it's already been fixed.