Could not find or load main class Testing

Question

I get the following error:

Error: Could not find or load main class Testing

My Testing.java code does contain a main method (below), so I'm not sure what the problem is.

import java.io.File;
import java.util.concurrent.TimeUnit;
import org.openqa.selenium.By;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.WebElement;
import org.openqa.selenium.firefox.FirefoxBinary;
import org.openqa.selenium.firefox.FirefoxDriver;
import org.openqa.selenium.firefox.FirefoxProfile;

public class  Testing {
    public static void main(String[] args) {
        FirefoxProfile profile = null;
        WebDriver driver = new FirefoxDriver(new FirefoxBinary(new File("C://Program Files (x86)//Mozilla Firefox//firefox.exe")), profile);
        //FirefoxDriver driver = new FirefoxDriver();
        driver.get("http://www.google.com");
        driver.manage().window().maximize();
    }
}