Yes, i have had that happen to me, i simply wont use 'LED_BUILTIN; But if you use the actual pin the LED is on it will compile and run. example: pinMode(13, OUTPUT); I think it is something wrong with the library file that has not been change…
code to test:
int LED=13;
// the setup function runs once when you press reset or power the board
void setup() {
// initialize digital pin LED_BUILTIN as an output.
pinMode(LED, OUTPUT);
}
// the loop function runs over and over again forever
void loop() {
digitalWrite(LED, HIGH); // turn the LED on (HIGH is the voltage level)
delay(1000); // wait for a second
digitalWrite(LED, LOW); // turn the LED off by making the voltage LOW
delay(1000); // wait for a second
}