[v1.4.0] Adafruit Feather nRF52840 Express: Cannot link to `Serial`

[zfields]

• Arduino board: Adafruit Feather nRF52840 Express

• Arduino IDE version (found in Arduino -> About Arduino menu): 1.8.19

• Adafruit nRF52 Boards version: 1.4.0

• List the steps to reproduce the problem below (if possible attach a sketch or copy the sketch code in too): LIST REPRO STEPS BELOW

1. Attempt to compile the follow code for the Adafruit Feather nRF52840 Express.

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  while (!Serial);
}

void loop() {
  // put your main code here, to run repeatedly:
  Serial.println("Hello, World!");
  delay(5000);
}

I have also tried downgrading to v1.3.0, but that did NOT make a difference.

[hathach]

just add #include "Adafruit_TinyUSB.h" would solve this. Btw, this issue should be reported in the Adafruit_nRF52_Arduino repo instead