Ive spent nearly 2 days just staring at the screen when the following error occurs, I have fully wiped my Arduino IDE from the computer and reinstalled but the same error continues with a missing library:
Arduino: 1.8.12 (Windows 10), Board: “Arduino Nano Every, ATMEGA328”
C:\Users*******\Documents\Arduino\libraries\RadioHead\RH_Serial.cpp:13:11: fatal error: HardwareSerial.h: No such file or directory
exit status 1
Error compiling for board Arduino Nano Every.
This report would have more information with
“Show verbose output during compilation”
option enabled in File → Preferences.