all compilers have to be fixed befor entering game mode ..

I saw other posts about this same problem but doesnt seem to apply on mine , i havent deleted any scripts or anything it just tell me 3 erros which i know i have to fix but i dont know how i went to the script and i dont an expert so couldent find any errorr , this is what the errors says : *Assets/Editor/ImageEffects/CreaseShadingEditor.cs(8,6): error CS1503: Argument #1' cannot convert object' expression to type System.Type' *Assets/Editor/ImageEffects/CreaseShadingEditor.cs(8,6): error CS1502: The best overloaded method match for UnityEditor.CustomEditor.CustomEditor(System.Type)' has some invalid arguments *Assets/Editor/ImageEffects/CreaseShadingEditor.cs(8,26): error CS0122: `UnityStandardAssets.ImageEffects.CreaseShading' is inaccessible due to its protection level

when i press on them ( take me to the error ) it shows this script on all of the erros ( doesnt seem to marker any line).

SCRIPT : namespace UnityStandardAssets.ImageEffects { [CustomEditor(typeof(CreaseShading))] class CreaseShadingEditor : Editor { SerializedObject serObj;

     SerializedProperty m_intensity;
     SerializedProperty m_softness;
     SerializedProperty m_spread;

     AnimBool m_showSoftnessWarning = new AnimBool();
     AnimBool m_showSpreadWarning = new AnimBool();

     private bool softnessWarningValue { get { return m_softness.intValue > 4; } }
     private bool spreadWarningValue { get { return m_spread.floatValue > 4; } }

     void OnEnable () {
         serObj = new SerializedObject (target);

         m_intensity = serObj.FindProperty("intensity");
         m_softness = serObj.FindProperty("softness");
         m_spread = serObj.FindProperty("spread");

         m_showSoftnessWarning.valueChanged.AddListener(Repaint);
         m_showSpreadWarning.valueChanged.AddListener(Repaint);

         m_showSoftnessWarning.value = softnessWarningValue;
         m_showSpreadWarning.value = spreadWarningValue;
     }

     public override void OnInspectorGUI () {
         serObj.Update ();

         EditorGUILayout.Slider(m_intensity, -5.0f, 5.0f, new GUIContent("Intensity"));

         EditorGUILayout.IntSlider(m_softness, 0, 15, new GUIContent("Softness"));
         m_showSoftnessWarning.target = softnessWarningValue;
         if (EditorGUILayout.BeginFadeGroup(m_showSoftnessWarning.faded))
         {
             EditorGUILayout.HelpBox("High Softness value might reduce performance.", MessageType.Warning, false);
         }
         EditorGUILayout.EndFadeGroup();

         EditorGUILayout.Slider(m_spread, 0.0f, 50.0f, new GUIContent("Spread"));
         m_showSpreadWarning.target = spreadWarningValue;
         if (EditorGUILayout.BeginFadeGroup(m_showSpreadWarning.faded))
         {
             EditorGUILayout.HelpBox("High Spread value might introduce visual artifacts.", MessageType.Warning, false);
         }
         EditorGUILayout.EndFadeGroup();

         serObj.ApplyModifiedProperties ();
     }
 }

}