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Question by Z2CSharp · Apr 24, 2013 at 09:39 PM · c#errorgameobjectgetcomponentnull reference exception

Null Reference Exception Help

I need help with 2 errors both dealing with Null Reference Exception.

public GameObject Unit_For_This_Script;

     void Update () 
     {
         Unit_Selector unit_Selector = Unit_For_This_Script.GetComponent<Unit_Selector>();
         if(unit_Selector.Unit_Selected == true)
         {
             print ("Hi");
         }

Error is on if(unit_Selector.Unit_Selected == true)

2 Unit is a defined GameObject in this script and is defined by hit.transform.gameObject;

 void Get_Unit_Statsf() // Retrieves the stats of the unit
     {
         if(Unit.name == "Test_Unit")
         {
             Max_Move = 2.0f;    
         }
     }

Error is on if(Unit.name == "Test_Unit")

Please help I don't understand why I am getting these errors as to me they make no sense and I am very good at using C# and Unity scripting.

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Answer by aldonaletto · Apr 25, 2013 at 02:58 AM

Apparently, the object referenced by Unit_For_This_Script doesn't have a script Unit_Selector - this would assign a null value to the variable unit_Selector, causing the first error. In the second case, probably the reference Unit isn't assigned when you try to read its name property.

Add debug lines to check these possibilities:

    Unit_Selector unit_Selector = Unit_For_This_Script.GetComponent<Unit_Selector>();
    if (!unit_Selector) print("Unit_Selector not found");
    ...

In the second script:

    void Get_Unit_Statsf() // Retrieves the stats of the unit
    {
        if(!Unit) print("Unit not assigned");
        ...
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