LitJson asking me to initialize the Json data before running script

I'm getting this error:
InvalidOperationException: The JsonData instance has to be initialized first
LitJson.JsonData.EnsureCollection ()
LitJson.JsonData.get_Count ()
ItemDatabase.ConstructItemDatabase () (at Assets/Scripts/ItemDatabase.cs:20)
ItemDatabase.Start () (at Assets/Scripts/ItemDatabase.cs:14)
this is my c# script

Code (CSharp):

1. using UnityEngine;
2. using System.Collections;
3. using LitJson;
4. using System.Collections.Generic;
5. using System.IO;
6.  
7. public class ItemDatabase : MonoBehaviour {
8.     private List <Item> database = new List<Item>();
9.     private JsonData itemData;
10.  
11.     void Start()
12.     {
13.         itemData = JsonMapper.ToObject(File.ReadAllText(Application.dataPath + "/StreamingAssets/Items.Json"));
14.         ConstructItemDatabase ();
15.         Debug.Log (database [1].Title);
16.     }
17.  
18.     void ConstructItemDatabase()
19.     {
20.         for (int i = 0; i < itemData.Count; i++) {
21.             database.Add(new Item((int)itemData[i]["id"], itemData[i]["title"].ToString(), (int)itemData[i]["value"]));
22.         }
23.     }
24. }
25.  
26. public class Item
27. {
28.     public int ID{ get; set;}
29.     public string Title{ get; set;}
30.     public int Value { get; set;}
31.  
32.     public Item(int id, string title, int value ){
33.         this.ID = id;
34.         this.Title = title;
35.         this.Value = value;
36.        
37.     }
38. }

 

Did you figure this out? I have similar code and have a different error:

KeyNotFoundException: The given key was not present in the dictionary. System.Collections.Generic.Dictionary`2[System.String,LitJson.JsonData].get_Item (System.String key) (at /Users/builduser/buildslave/mono-runtime-and-classlibs/build/mcs/class/corlib/System.Collections.Generic/Dictionary.cs:150)
LitJson.JsonData.get_Item (System.String prop_name)
ItemDatabase.ConstructItemDatabase () (at Assets/Scripts/ItemDatabase.cs:29)
ItemDatabase.Start () (at Assets/Scripts/ItemDatabase.cs:14)

 

Hi, guys did you find an answer for LitJson and InvalidOperationException: The JsonData instance has to be initialized first?

 

I know this is an old thread, but I just ran into the same issue while working with Unity and LitJson (and also branching from the above referenced item database tutorial)

The issue that I found/corrected, is that I had somehow overwritten my items.json contents to be blank; and so the ConstructItemDatabase method was unable to reference the data (basically the same as 'Object not set to an instance of an object' for any regular object)..

Check to make sure your items.json is populated, or add error handling.

Hope this helps!