BCE0018 asset package giving error, folder is in standard assets.

Here i have the code, ive scoured the forums but cant find any fix: unction OnInspectorGUI () {
serObj.Update ();

     GUILayout.Label("Various luminance based fullscreen Antialiasing techniques", EditorStyles.miniBoldLabel);
     
     EditorGUILayout.PropertyField (mode, new GUIContent ("AA Technique"));
     
     var mat : Material = (target as AntialiasingAsPostEffectEditor.CurrentMaterial) ();
     if(null == mat) {
         EditorGUILayout.HelpBox("This AA technique is currently not supported. Choose a different technique or disable the effect and use MSAA instead.", MessageType.Warning);            
     }

i am getting the error :the name AntialiasingAsPostEffectEditor.CurrentMaterial does not denote a valid type('not found').

Please help!