Problem with code for IR remote controlled robot

Using Arduino Programming Questions
1

I get the following error when compiling the code:

Arduino: 1.6.10 (Windows 10), Board: "Arduino/Genuino Uno"

Tone.cpp.o (symbol from plugin): In function `timer0_pin_port':

(.text+0x0): multiple definition of `__vector_7'

libraries\Arduino-IRremote-master\IRremote.cpp.o (symbol from plugin):(.text+0x0): first defined here

collect2.exe: error: ld returned 1 exit status

exit status 1
Error compiling for board Arduino/Genuino Uno.

This report would have more information with
"Show verbose output during compilation"
option enabled in File -> Preferences.

Please tell me how to rectify this!!

#include <IRremote.h>
#include <AFMotor.h>
AF_DCMotor rightMotor(1); // Right motor connected to port 1
AF_DCMotor leftMotor(2); // Left motor connected to port 2

IRrecv irrecv(A1);// IR receiver connected to pin A1(ANALOG PINS ON MOTOR SHIELD USED AS DIGITAL INS!)
decode_results results;

#define Straight 0xC1CC42BD
#define Right 0xC1CCA25D
#define Left 0xC1CC22DD
#define Back 0xC1CCC23D

void setup(){
  Serial.begin(9600); // Establishing Serial Communication
  irrecv.enableIRIn(); // Start the receiver
  pinMode(A3, OUTPUT); // Set buzzer - pin A3 as an output

  for(int i=0; i<200 ; i+=50){
    tone(A3, i);
    delay(1000);
    }

  }
void loop() {
  if (irrecv.decode(&results)){ //Have we received an IR signal??
      translateIR();
      irrecv.resume(); // Receive the next value
    
    }
  }  

void translateIR(){
    switch(results.value){
      case Straight:
        moveForward();
        break;

    case Right:
      turnRight();
      break;
      
    case Left:
      turnLeft();
      break;
      
    case Back:
      moveBackward();
      break;

    default:
      Stop();
      break;
      }
  }

void moveForward() {
    buzz();
    leftMotor.setSpeed(255);
    rightMotor.setSpeed(255);
    leftMotor.run(FORWARD);
    rightMotor.run(FORWARD);
}

void turnRight(){
  buzz();
  leftMotor.setSpeed(200);
  rightMotor.setSpeed(200);
  leftMotor.run(FORWARD);
  rightMotor.run(BACKWARD);
  delay(400);
 
  leftMotor.run(FORWARD);
  rightMotor.run(FORWARD);      
} 

void turnLeft() {
  buzz();
  leftMotor.setSpeed(200);
  rightMotor.setSpeed(200);
  leftMotor.run(BACKWARD);
  rightMotor.run(FORWARD);
  delay(400);
  
  leftMotor.run(FORWARD);
  rightMotor.run(FORWARD);
}  
void moveBackward() {
    buzz();
    leftMotor.setSpeed(200);
    rightMotor.setSpeed(200);
    leftMotor.run(BACKWARD);
    rightMotor.run(BACKWARD);
}

void Stop(){
    leftMotor.setSpeed(0);
    rightMotor.setSpeed(0);
  
}

void buzz(){
  tone(A3,100); 
  delay(500);
}
2

tone and ir have an interrupt conflict.
I had to use a 555 oscillator to work around it.

3

I changed the code and it compiles with no errors but the robot doesn't move when a button is pressed and nothing shows up on the Serial monitor, is it because I've used the analog pin for the IR receiver?

#include <IRremote.h>
#include <AFMotor.h>
AF_DCMotor rightMotor(1); // Right motor connected to port 1
AF_DCMotor leftMotor(2); // Left motor connected to port 2
IRrecv irrecv(A2);// IR receiver connected to pin A2(ANALOG PINS ON MOTOR SHIELD USED AS DIGITAL INS!)
decode_results results;
#define Straight 0xC1CC42BD
#define Right 0xC1CCA25D
#define Left 0xC1CC22DD
#define Back 0xC1CCC23D

void setup(){
  Serial.begin(9600); // Establishing Serial Communication, THIS IS IMPORTANT!!
  irrecv.enableIRIn(); // Start the receiver
  

 

  }
void loop() {
  if (irrecv.decode(&results)){ //Have we received an IR signal??
      
      translateIR();
      irrecv.resume(); // Receive the next value
    
    }
  }  

void translateIR(){
    switch(results.value){
      case 0xC1CC42BD:
        moveForward();
        break;

    case Right:
      turnRight();
      break;
      
    case Left:
      turnLeft();
      break;
      
    case Back:
      moveBackward();
      break;

    default:
      Stop();
      break;
      }
  }

void moveForward() {
    
    leftMotor.setSpeed(255);
    rightMotor.setSpeed(255);
    leftMotor.run(FORWARD);
    rightMotor.run(FORWARD);
}

void turnRight(){
  
  leftMotor.setSpeed(200);
  rightMotor.setSpeed(200);
  leftMotor.run(FORWARD);
  rightMotor.run(BACKWARD);
  delay(400);
 
  leftMotor.run(FORWARD);
  rightMotor.run(FORWARD);      
} 

void turnLeft() {
  
  leftMotor.setSpeed(200);
  rightMotor.setSpeed(200);
  leftMotor.run(BACKWARD);
  rightMotor.run(FORWARD);
  delay(400);
  
  leftMotor.run(FORWARD);
  rightMotor.run(FORWARD);
}  
void moveBackward() {
    
    leftMotor.setSpeed(200);
    rightMotor.setSpeed(200);
    leftMotor.run(BACKWARD);
    rightMotor.run(BACKWARD);
}

void Stop(){
    leftMotor.setSpeed(0);
    rightMotor.setSpeed(0);
  
}