I get this error when uploading in the Web Editor (create.arduino.cc)
We couldn't find a tool with the name avrdude and version 6.3.0-arduino9 packaged by undefined
Windows 10
Chrome
Windows Plugin tray icon is teal
See the other thread about the issue.
It has been reported but its doubtful much will get done until Monday.
This has been fixed, please let us know if you are still experiencing this issue and thank you for your patience.