NullReferenceException in coroutine when using a function

Can you post the full error? And also the lines of the function listed in the error

Yes we need to see the full exception stack trace.

NullReferenceException UnityEngine.$$anonymous$$onoBehaviour.StartCoroutine (IEnumerator routine) Chart$$anonymous$$anagers.CountryChange (System.String strFlag) (at Assets/_src/Chart$$anonymous$$anagers.cs:8) Test.Start () (at Assets/_src/Test.cs:13)

using UnityEngine; using System.Collections;

public class Test : $$anonymous$$onoBehaviour {

 // Use this for initialization
 void Start () 
 {
     Chart$$anonymous$$anagers cm = new Chart$$anonymous$$anagers();
     
     //StartCoroutine( cm.GetChart("gb") );
     
     cm.CountryChange("gb");
     
     Debug.Log("Done");
 }
 

}

using UnityEngine; using System.Collections;

public class Chart$$anonymous$$anagers : $$anonymous$$onoBehaviour {

 public void CountryChange(string strFlag)
 {
     StartCoroutine( GetChart(strFlag) );
 }    
 
 public IEnumerator GetChart(string strCountry)
 {
     string url = "https://itunes.apple.com/gb/rss/topsongs/limit=10/json";
     
     WWW www = new WWW(url);
     yield return www;

     Debug.Log(www.text);
 }

}

Heres all the code and error :)

This is just code that I quickly mocked up to test and make sure it wasn't something else. All the above code can be pasted into unity to demonstrate the error :)

Your problem is that you are trying to create a $$anonymous$$onoBehaviour using "new". This is expressly forbidden.

A monobehaviour $$anonymous$$UST be owned by a GameObject to make sense.

You need to either add it in the i spector and use GetComponent OR use gameObject.AddComponent()

Either way do NOT use "new"

Well what I posted is the problem with the code you showed us.

If you arent showing us the actual code thats generating the error inside of Unity then there is no way for us to help you\ and you are wasting our time.