Mac OS X Board thingdev (platform esp8266, package esp8266) is unknown

Here is a quick fix if you run into the error:
“Board thingdev (platform esp8266, package esp8266) is unknown”

This will remove all of your Arduino boards and preferences

1. open a terminal
2. type cd to access your home directory
3. type cd Library
4. type rm -rf Arduino15/ to remove all Arduino settings
5. follow the instructions found here to reinstall:

Author: sirspot

I write software, love my wife and kids, do various house projects, play video games when I have time, and could use a little more sleep