the compiler is complaining about gradientpaint. iwant my applet to display a thick line that blue and white

import java.applet.Applet;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.geom.Line2D;

public class BlueWhiteLineApplet extends Applet
{
public void paint(Graphics g)
{
// recover Graphics2D

Graphics2D g2 = (Graphics2D)g;

GradientPaint bluetowhiteVert = new GradientPaint(150,20,Color.blue,150,70,Color.white );
g2.setPaint(bluetowhiteVert);
g2.draw(new Line2D.Double(150,20,250,70));
}
}