error while uploading sketch

int ledPin = 13;
int switchPin = 9;
int switchValue = HIGH;

void setup() {
  pinMode(ledPin, OUTPUT);
  pinMode(switchPin, INPUT_PULLUP);

}

void loop() {
  switchValue = digitalRead(switchPin);
  digitalWrite(ledPin, switchValue);
  
 delay(50);
}

Do we have to guess what the error is?

The sketch is irrelavent when the error is in the upload. It obviously compiled, or there would have been no attempt to upload.