User Program Upload Error - IDE 1.x - Arduino Forum
java.lang.nullpointerexception error when installing via board mngr · Issue #7325 · esp8266/Arduino · GitHub
Arduino-er: My Arduino 1.6.3 cannot detect port
Arduino-er: My Arduino 1.6.3 cannot detect port
tutorials:learn:arduino:help.html [AdaWiki]
Macros not working with v1.99.3 for Atreus and java.lang. NullPointerException when trying to get the 'master' branch installed in the Arduino IDE - Help and Getting Started - Keyboardio community