Unproject Batch #libgdx

Newbie & Debugging Questions
#1

Im trying to unproject from the batch… How can i do it?

 
...
batch.setProjectionMatrix(orthoCamera.combined);

        batch.begin();
        player.render(batch);
        batch.flush();
        batch.end();

        //orthoCamera.projection.inv();
        //orthoCamera.view.inv();
        //orthoCamera.update(true);
       
        stage.getBatch().setProjectionMatrix(orthoCamera.combined);
        stage.draw();
...