What do i need to fix to reolve the errors?

import java.io.*;

class Multiply{

public static void main(String[] args) {

int total,a,b;

System.out.println("Enter a: ");

a=IO.readInt();

System.out.println("Enter b: ");

b=IO.readInt();

total =a*b;

System.out.println("The multiplication of "+ a + " * "+b+" is "+total);

}

}

**********************************************

Error: Could not find or load main class Multiply.java

**********************************************