I can't seem to see the mistake here

```

class Calculator {

int a;
int b;

public Calculator() {

}

public add() {
return (a+b);

}

public substract() {
return (a-b);

}

public multiply() {

return (a*b);

}

public divide() {
  
  if (b <=0){
    
   System.out.println("Error! Dividing by zero is not allowed."); 
    return 0;
    
  } else { 
  	return (a/b);
  }
}

public modulo(){
if (b=0) {
System.out.println(“Error! Dividing by zero is not allowed.”);
return 0;
} else {
return (a%b);
}
}
public static void main(String args) {

Calculator myCalculator = new Calculator();
System.out.println(myCalculator.add(5,7));
System.out.println(myCalculator.substract(45,11));
}

}

<do not remove the three backticks above>

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