Error: collect2: error: id return 1 exit status

[Andreiciortea061108]

I was working on something and when I added a buzzer and the code for it and I got this error:
"collect2: error: id return 1 exit status" . The code works if I remove the code for the buzzer(
tone(buzzer, 1000) and noTone(buzzer) ) but with it I get the error. This is the code:

#include <SPI.h>
#include <MFRC522.h>
#include <Servo.h>
#include <NewPing.h>
#define RST_PIN         5
#define SS_PIN          53
MFRC522 mfrc522(SS_PIN, RST_PIN);
Servo Barrier1;
const int red = 48, green = 49, buzzer = 41;
int distance;
String uid1 = "53 AF F6 38";
NewPing sonar (31, 30, 20);
void setup() {
Barrier1.attach(32);
pinMode[red, OUTPUT];
pinMode[green, OUTPUT];
pinMode[buzzer,OUTPUT];
Serial.begin(9600);
SPI.begin();
mfrc522.PCD_Init();
delay(50);
}

void loop() {


  distance = sonar.ping_cm();
  if (distance >= 1)
  {
    digitalWrite(red, HIGH);
    digitalWrite(green, LOW);
  }
  else
  {
    digitalWrite(red, LOW);
    digitalWrite(green, HIGH);
  }

  if ( ! mfrc522.PICC_IsNewCardPresent()) {
    return;
  }

  
  if ( ! mfrc522.PICC_ReadCardSerial()) {
    return;
  }

  
  String content = "";
  byte letter;
  for (byte i = 0; i < mfrc522.uid.size; i++)
  {
    content.concat(String(mfrc522.uid.uidByte[i] < 0x10 ? " 0" : " "));
    content.concat(String(mfrc522.uid.uidByte[i], HEX));
  }
  content.toUpperCase();
  if (content.substring(1) == uid1) 
  {
    Serial.println("uid1");
      tone(buzzer, 1000);
      delay(500);
      noTone(buzzer);
  }
  else if (content.substring(1) != uid1)
  {
    Serial.println("Unknown uid");
  }
  delay(1000);
}

Thanks for any help!

[groundFungus]

You have a conflict where libraries and/or functions are trying to use the same timer.

Maybe the tone() function and the Servo library. Maybe try the ServoTimer2 library?

More information if you Google "collect2: error: id return 1 exit status".

In the future please include the entire error message. It is easy to do. There is a button (lower right of the IDE window) called "copy error message". Copy the error and paste into a post in code tags. Paraphrasing the error message leaves out important information.

[Andreiciortea061108]

Tried removing it and it still gives me the error.

[groundFungus]

Then you will need to find out where the conflicts are and deal with them. For instance, the NewPing library may be the source of a conflict. You can use the rangefinder without a library.
See here.

[Andreiciortea061108]

Thanks for help, I will try!