c# - Unity 5 Upgrade Made Script from Unity 4.6 stop work -

the code below worked fine while using unity 4.6

using unityengine; using system.collections; public class hadescontroller : monobehaviour { public float maxspeed = 10f; bool facingright = true;  animator anim;  bool grounded = false; public transform groundcheck; float groundradius = 0.2f; public layermask whatisground; public float jumpforce = 700f;  void start () {     anim = getcomponent<animator>(); } void fixedupdate () {     grounded = physics2d.overlapcircle (groundcheck.position, groundradius, whatisground);     anim.setbool ("ground", grounded);     anim.setfloat ("vspeed", getcomponent<rigidbody2d>().velocity.y);     if (!grounded)                     return;     float move = input.getaxis ("horizontal");     anim.setfloat("speed", mathf.abs (move));     getcomponent<rigidbody2d>().velocity = new vector2 (move * maxspeed, getcomponent<rigidbody2d>().velocity.y);     if (move > 0 &&!facingright)         flip ();     else if (move <0 && facingright)         flip (); } void update() {     if (grounded && input.getkeydown (keycode.space))      {         anim.setbool("ground", false);         getcomponent<rigidbody2d>().addforce(new vector2(0, jumpforce));     } } void flip() {     facingright = !facingright;     vector3 thescale = transform.localscale;     thescale.x *= -1;     transform.localscale = thescale; } } 

after upgraded unity 5 gave me error message: unassignedreferenceexception: variable groundcheck of hadescontroller has not been assigned. need assign groundcheck variable of hadescontroller script in inspector. unityengine.transform.get_position () (at c:/buildslave/unity/build/artifacts/generated/common/runtime/unityenginetransform.gen.cs:28) hadescontroller.fixedupdate () (at assets/scripts/hadescontroller.cs:21)

this straightforward error. need see part of exception:

you need assign groundcheck variable of hadescontroller script in inspector.

that is, transform assigned groundcheck somehow lost , groundcheck null. should reassign it. drag , drop assigned transform (or gameobject) groundcheck in inspector again.

add debug check before error line , should see if it's null or not:

debug.log("groundcheck null: " + (groundcheck == null));