What's the matter with my Cube.fbx?

Try na$$anonymous$$g it to something else.

Why is your FBX in the OnGUI function? What are you trying to do? Can we see your code? There really shouldnt be a problem. Just export your model to unity as an FBX, then drag the model into your scene. Also, make it into a prefab as well.

I've made two four different animations in ex2D and now i created the cube and i got this error straight away. This is the ONLY self-made script that i use. I've added a simple sprite to the cube, with a ground tile. That's all.

 using UnityEngine;
 using System.Collections;
 
 public class Controls : $$anonymous$$onoBehaviour {  
 
     public exSpriteAnimation spAnim;
     private string last_anim;
 
     void Update() {  
     
         if (Input.Get$$anonymous$$ey($$anonymous$$eyCode.D)) 
         {
             if (!spAnim.IsPlaying("r_walk_ani")) 
             {
                 spAnim.Play("r_walk_ani");
                 last_anim = "r_walk_ani";
             }
             
             //this.transform.Translate(Vector3.right*150f*Time.deltaTime);
             
         }else if (Input.Get$$anonymous$$ey($$anonymous$$eyCode.A)) 
         {
             if (!spAnim.IsPlaying("l_walk_ani")) 
             {
                 spAnim.Play("l_walk_ani");
                 last_anim = "l_walk_ani";
             }
             
             //this.transform.Translate(Vector3.left*150f*Time.deltaTime);
             
         }else if(!spAnim.IsPlaying("r_idle_ani") && last_anim == "r_walk_ani")
         {
             spAnim.Play ("r_idle_ani");
         }else if(!spAnim.IsPlaying("l_idle_ani") && last_anim == "l_walk_ani")
         {
             spAnim.Play ("l_idle_ani");
         }
     
     }  
 }