"A field initializer cannot reference the non-static..." error when accessing script from another object

Questions & Answers
1

First off, I’m new to unity and C#, so the chances are very high I’ve just missed something really basic, but after hours of searching, I can’t figure out why I get this error. All of the examples I see seem to have cubeScript cScript = cCube.GetComponent(); separate from any functions, but I can’t get it to work in anything other than the Start () function. Am I supposed to have it in Start ()? And if so, how do I access it in the rest of the script? (Right now I get the “Does not exist in current context” error). My code is :

public class playerScript : MonoBehaviour {

     public GameObject cCube;
     cubeScript cScript = cCube.GetComponent<cubeScript>();
     // Use this for initialization

     void Start () {
     }

     // Update is called once per frame
     void Update () {
	    if (cScript.isColliding == true) {
		//do stuff
	     }
     }
 }

And:

public class cubeScript : MonoBehaviour {

     public bool isColliding = false;

     void OnCollsionEnter(Collision col) {
	     if (col.gameObject != null) {
		     isColliding = true;
	     }
     }
 }
2

You can’t set a field that way in a class. Use the Start method to set the field variable cScript:

public class playerScript : MonoBehaviour {
 
     public GameObject cCube;
     cubeScript cScript;
     // Use this for initialization
 
     void Start () {
        cScript = cCube.GetComponent<cubeScript>();
     }
 
     // Update is called once per frame
     void Update () {
        if (cScript.isColliding == true) {
        //do stuff
         }
     }
 }