error : An instance of type "UnityEngine.MonoBehaviour

Unity Engine
1

i get this error:
An instance of type “UnityEngine.MonoBehaviour” is required to access non static member “StartCoroutine”

i ma trying to use ZoomIn function that is in SceneControl script from another script

it works when i use from another script like this:

 StartCoroutine(SceneControl.ZoomIn());

but it doesnt work work when i have something like this:

 SceneControl.IsolateObject();

and in IsolateObject is the ZoomIn function
i tried with and without StartCoroutine, it just dont work, and it spits out this error.

SceneControl is just a script that holds static functions…

2

Coroutines need to run on a specific monobehaviour. Since static functions are not attached to one automatically, you will need to do this manually by calling someMonoBehaviourInYourScene.StartCoroutine(coroutine).

For example (since you mention StartCoroutine, I’m assuming you use C# here):

static void RunCoroutine(GameObject param)
{
    MonoBehaviour someMonoBehaviour = param.GetComponent<MonoBehaviour>();

    someMonoBehaviour.StartCoroutine(DoStuff());
}

This will run DoStuff on someMonoBehaviour for as long as it isn’t destroyed.

3

no i am using javascript…is there a equivalent to this code? thanks!

4

My JS is a bit rusty, but something like this should work

static function RunCoroutine(param : GameObject)
{
    someMonoBehaviour = param.GetComponent(MonoBehaviour);

    someMonoBehaviour.StartCoroutine(DoStuff());
}
5

i am not sure how to implement your idea…

here is the part of code that illustrates what i have so far:

SceneControl script:

  static var cam : MainCamera;
  
//NEEDED FOR CALCULATING DISTANCES
static var currentCameraDistance : float;
static var previousCameraDistance : float;

function Start(){
  cam=GameObject.Find("MainCamera").GetComponent("MainCamera");
}

static function ZoomIn(distance : float,endDistance : float){
  var t = 0.0;
  while (t<1.0){
	
  t+=Time.deltaTime *(1.0/0.2);		
  cam.distance=Mathf.Lerp(distance,endDistance,t);
  yield;
 }
}

static function FunctionWithZoom()
{
 
 ZoomIn(start,end);

}

any other script where i want to use ZoomIn function from SceneControl script:

//this works but it doesnt give me flexibility:
StartCoroutine(SceneControl.ZoomIn(start,end));


//is i start the function from SceneControl  that //uses ZoomIn function it doesnt work and it gives me //the error in the title...
  SceneControl.FunctionWithZoom();

also, one more question…is this good way in keeping function that repeat through the game in one script, like this with static function…it just stroke me that i could use GetComponent to get the gameobject that holds this script, that way function wouldnt need to be static…is that right?

6

I’m not sure why your StartCoroutine line that works is not flexible, but you are right that using GetComponent and a non-static function will solve your problem. Alternatively, you could make your FunctionWithZoom() look for the SceneControl object in the scene. That way FunctionWithZoom can still be static (which, i assume, you want for convenient access).