forcing unload a file after error

My game requires a JSON to be loaded in. I use the following code for the user to select his JSON file:

 GUILayout.BeginHorizontal ();
 if (GUILayout.Button ("Load")) {
     string newFilePath = EditorUtility.OpenFilePanel("Select JSON file", Application.streamingAssetsPath, "json");
 
     if (newFilePath.Length != 0) {
         JSONLines = "";
         filePath = newFilePath;
         StreamReader reader = new StreamReader(filePath);
         while ((line = reader.ReadLine()) != null)
         {
             JSONLines += line;
         }
        JSONParser jp = new JSONParser(JSONLines);
        jp.parseJSONData();
     }
 }
 GUILayout.EndHorizontal ();

The JSON parsing is working as intended in the JSONParser class. I also have a static bool in here called 'erorrInJSON'. This is set to true as soon as I notice there is a mistake in the JSON file.

Now this is where my problem lies, how do I properly handle this? I will need somewhere the following code:

 if (jp.errorInJSON) {
     //show a message to the player that the JSON is not OK 
     //AND make all the code in this GUILayout.Button ("Load")) restart from 0 ???
 }

Thanks in advance to anyone who can help me!