1151: A conflict exists with definition textFieldName in namespace internal

1

Hi everyone, been searching for answers to my problems here lately and atleast google didnt give me a straight answer to this one. Ok so here comes me question:

i want to be able to use this function to create textfields with unique names. how do i change this so that i can read the parameter value to the new variable without having this namespace conflict?

 
function createTextField(textFieldName:String,inputField:String,formatType:String,contentBackgroundMovieClip:String):TextField {
       
   
   var textFieldName:TextField = new TextField();
            textfieldName.embedFonts = true;
            textfieldName.autoSize = TextFieldAutoSize.LEFT;
            textfieldName.antiAliasType = AntiAliasType.ADVANCED;
            textfieldName.setTextFormat = setTextFormat(formatType);
            textfieldName.selectable = false;
            textfieldName.mouseEnabled = true;
            textfieldName.text = inputField;
   textfieldName.toUpperCase();
   
   contentBackgroundMovieClip.addChild(textFieldName);
            
        
        }