MacOS High Sierra not working

Hi

I've upgraded to high sierra and now I can't upload any sketch to my boards. I'm always getting the following error: avrdude: stk500_getsync()

What could be the problem?

Thanks for your help.

Sorry, seams to work now. Upgraded to lastest Version 1.8.5 and then tools get-board-info worked again and I could upload sketches.