glOrthod problem LWJGL

Newbie & Debugging Questions
#1

Yes, again, another LWJGL problem. Here’s the problem.

I’m following a tutorial for LWJGL and have a problem with my basic code.
Where the glOrtho(float, float, float, foat, float) is, It gives an error.

Error:

the method glOrtho(double, double, double, double, double) in the type GL11 is applicable for the arguments (int, int, int, int, int)

The code is:


import static org.lwjgl.opengl.GL11.*;
import org.lwjgl.opengl.*;
import org.lwjgl.*;


public class MAin {
	
	public MAin() {
		try {
			Display.setDisplayMode(new DisplayMode(500, 500));
			Display.setTitle("GAME");
			Display.create();
		} catch (LWJGLException e) {
			
			e.printStackTrace();
		}
		
		//Initialization
		glMatrixMode(GL_PROJECTION);
		glLoadIdentity();
		//ERROR IN glOrtho: 
		glOrtho(0, 640, 480,-1, 1);
		glMatrixMode(GL_MODELVIEW);
		
		//Game Loop
		while (!Display.isCloseRequested()) {
			Display.update();
			Display.sync(60);//60 fps
		}
	}



	public static void main(String []args) {
		new MAin();
	}
}