Proble with getPhysicsSpace()

Hello i really need help about getPhysicsSpace()
i’m still beginner and i don’t know what should i do because i just copy some code

package mygame;

import com.jme3.animation.AnimChannel;
import com.jme3.animation.AnimControl;
import com.jme3.animation.AnimEventListener;
import com.jme3.animation.LoopMode;
import com.jme3.app.SimpleApplication;
import com.jme3.app.state.AppState;
import com.jme3.bullet.BulletAppState;
import com.jme3.bullet.PhysicsSpace;
import com.jme3.bullet.collision.shapes.CapsuleCollisionShape;
import com.jme3.bullet.control.CharacterControl;
import com.jme3.input.KeyInput;
import com.jme3.input.controls.ActionListener;
import com.jme3.input.controls.KeyTrigger;
import com.jme3.light.DirectionalLight;
import com.jme3.math.ColorRGBA;
import com.jme3.math.Vector3f;
import com.jme3.renderer.RenderManager;
import com.jme3.scene.Node;
import com.jme3.scene.Spatial;
import com.jme3.bullet.control.RigidBodyControl;
import com.jme3.input.ChaseCamera;

/**
 * test
 * @author normenhansen
 */
public class Main extends SimpleApplication implements AnimEventListener{

    private Spatial sceneModel;
    protected Vector3f V = new Vector3f(0, 0, 0);
    private AnimChannel animchannel,animchannel2;
    private AnimControl anim;
    private CharacterControl character;
    private Node SinbadNode;
    private ChaseCamera chaseCam;
    private RigidBodyControl landscape;
    boolean isRun = false;
    Vector3f walkDirection = new Vector3f();
    
    public static void main(String[] args) {
        
        Main app = new Main();
        app.start();
    }
    
    
     ActionListener action = new ActionListener(){

            public void onAction(String name, boolean isPressed, float tpf) 
            {                
                if(isRun)
                {
                    if(name.equals("Top"))
                    {                 
                        SinbadNode.getLocalTranslation();
                        animchannel.setAnim("RunTop");
                        animchannel2.setAnim("RunBase");
                       SinbadNode.move(0, 0, 15*speed);
                        isRun = true;
                    }
                
                    if(!isPressed)
                    {
                        animchannel.setAnim("IdleTop");
                        animchannel.setAnim("IdleBase");
                        isRun = false;
                    }
                }
                
            }
        };
   
     private PhysicsSpace getPhysicsSpace() {
        return BulletAppState.getPhysicsSpace();
    }
    
    public void initKeys()
    {
        inputManager.addMapping("Up", new KeyTrigger(KeyInput.KEY_W));
        inputManager.addMapping("Down", new KeyTrigger(KeyInput.KEY_S));
        inputManager.addMapping("Left", new KeyTrigger(KeyInput.KEY_D));
        inputManager.addMapping("Right", new KeyTrigger(KeyInput.KEY_A));
                                      
        
        inputManager.addListener(actionlistener, new String[]{"Pause"});
        inputManager.addListener(action, new String[]{"Up","Down","Left","Right"});
    };
    @Override
    public void simpleInitApp(){
        setDisplayFps(false);
        setDisplayStatView(false);
        this.inputManager.clearMappings(); 
        
        Vector3f camDir = cam.getDirection().clone().multLocal(0.1f);
        Vector3f camLeft = cam.getLeft().clone().multLocal(0.1f);
        
        //TERRAIN
        viewPort.setBackgroundColor(new ColorRGBA(0.7f, 0.8f, 1f, 1f));  
        sceneModel = assetManager.loadModel("Scenes/Scene.j3o");
        rootNode.attachChild(sceneModel);
                  
        flyCam.setMoveSpeed(30);
        flyCam.setEnabled(false);
        
        AppState bulletAppState = new BulletAppState();   
        stateManager.attach(bulletAppState);
        
                              
        
        anim = SinbadNode.getControl(AnimControl.class);
        //anim.addListener(this);
        animchannel = anim.createChannel();
        animchannel2 = anim.createChannel();
        
        //animchannel.setAnim("IdleBase");
        //animchannel2.setAnim("IdleTop");
                
        chaseCam = new ChaseCamera(cam, SinbadNode, inputManager);
                
        rootNode.addLight(new DirectionalLight());
        character.setWalkDirection(walkDirection);
        initKeys();
    }

    @Override
    public void simpleUpdate(float tpf) 
    {
        
    }

    @Override
    public void simpleRender(RenderManager rm) {
        //TODO: add render code
    }
    
    private ActionListener actionlistener = new ActionListener() {

        public void onAction(String name, boolean isPressed, float tpf) 
        {                      
            if(name.equals("Run") && !isPressed)
            {
                if (!animchannel.getAnimationName().equals("Run")) {
               animchannel.setAnim("Stand", 0.50f);
               animchannel.setLoopMode(LoopMode.Cycle);
            }
            }
    }
    };   
    
    public void initChar()
    {
        CapsuleCollisionShape capsule = new CapsuleCollisionShape(3f, 4f);
        character =  new CharacterControl(capsule, 0.01f);
        SinbadNode = new Node("Sinbad Node");
        SinbadNode = (Node)assetManager.loadModel("Models/Sinbad/Sinbad.mesh.xml");
        SinbadNode.addControl(character);
        rootNode.attachChild(SinbadNode);  
        getPhysicsSpace().add(character);
    }

    public void onAnimCycleDone(AnimControl control, AnimChannel channel, String animName) 
    {
        if(animName.equals("IdleBase"))
        {
            channel.setSpeed(2f);
            channel.setAnim("Dance");
        }
    }

    public void onAnimChange(AnimControl control, AnimChannel channel, String animName) {
        
    }

    
}

Whats the problem with getPhysicsSpace() ?
Could you please give us some more information?

first, learn how ho ask questions mikeash.com: Getting Answers
second, go through all tutorials https://wiki.jmonkeyengine.org/legacy/doku.php/jme3:beginner:hello_simpleapplication
third, you never call initChar() from your code, i dont know how did you come up with question about getPhysicsSpace() while you never use it