How to draw a line using libgdx?

I am trying to draw some lines for debugging using libgdx but I failed. this is my code ``` public class MainMenu extends Screen implements InputProcessor { private OrthographicCamera camera; SpriteBatch myBatch; ShapeRenderer shapeDebugger; public MainMenu(Game game) { super(game); camera= new OrthographicCamera(Gdx.graphics.getWidth(), Gdx.graphics.getHeight()); camera.setToOrtho(true, Gdx.graphics.getWidth(), Gdx.graphics.getHeight()); camera.update();} @Override public void render(float delta) { Gdx.gl.glClearColor(0, 0, 0, 1); Gdx.gl.glClear(GL10.GL_COLOR_BUFFER_BIT); myBatch.begin(); stage.draw(); Gdx.gl10.glLineWidth(10); shapeDebugger.setProjectionMatrix(camera.combined); shapeDebugger.begin(ShapeType.Line); shapeDebugger.setColor(1, 1, 1, 1); shapeDebugger.line(2, 2, 5, 5); myBatch.end(); } } ``` I get an error from line shapeDebugger.setProjectionMatrix(camera.combined); @Pranav008 thank you very much. I didn't expect that I need to initiate it. but I've got a true problem. I draw the line to center of the game screen like this. ``` Gdx.gl10.glLineWidth(2); shapeDebugger.setProjectionMatrix(camera.combined); shapeDebugger.begin(ShapeType.Line); shapeDebugger.setColor(1, 1, 1, 1); shapeDebugger.line(Gdx.graphics.getWidth()/2, 0,Gdx.graphics.getWidth()/2, Gdx.graphics.getHeight()); shapeDebugger.end(); ``` when I try to resize the screen it doesn't update the to center it goes far away to right.