Cannot compile without using serial port

[sunnyguhz]

• Arduino IDE version (found in Arduino -> About Arduino menu):
  2.3.2

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

It Cannot compile without using serial port with STM32.

c:\Users\Sunnygu\Documents\Arduino\libraries\Adafruit_Unified_Sensor\Adafruit_Sensor.cpp: In member function 'void Adafruit_Sensor::printSensorDetails()':
c:\Users\Sunnygu\Documents\Arduino\libraries\Adafruit_Unified_Sensor\Adafruit_Sensor.cpp:11:3: error: 'Serial' was not declared in this scope; did you mean 'Serial2'?
   11 |   Serial.println(F("------------------------------------"));
      |   ^~~~~~
      |   Serial2