NullPointExeption in simple Script

Hey,
I'm trying to create a small ModManager. My Problem, which occured as soon as I'm trying to Add Mods to a Dictionary, is a NullPointExeption.

Code (CSharp):

1. NullReferenceException: Object reference not set to an instance of an object
2. ModManager.Awake () (at Assets/Scripts/ModManager.cs:30)
3.  

This is my Script

Code (CSharp):

1. using System.Collections;
2. using System.Collections.Generic;
3. using UnityEngine;
4.  
5. public class ModManager : MonoBehaviour
6. {
7.     public static ModManager instance;
8.     public Dictionary<string, string> LoadedMods;           //Modname (value),  Modpath (key)
9.     public Dictionary<string, string> LoadedModsVersion;    //Version (value),  Modpath (key)
10.  
11.     void Awake()
12.     {
13.         if (instance == null)
14.         {
15.             // No other Mod Manager excisting
16.             instance = this;
17.         }
18.         else if (instance != this)
19.         {
20.             // if this Instance is not the active Mod Manager
21.             Destroy(gameObject);
22.         }
23.         DontDestroyOnLoad(gameObject);
24.  
25.  
26.  
27.         // ADD Default Mods to test
28.             for (int i = 0; i < 12; i++)
29.             {
30.                 LoadedMods.Add("Modpath_" + i, "Modname_" + i);
31.                 LoadedModsVersion.Add("Modpath_" + i, "Version_" + i);
32.                 Debug.Log("Added "+i+ " Mods");
33.             }
34.     }
35. }
36.  

This is the Line Which makes Problems:

LoadedMods.Add("Modpath_" + i, "Modname_" + i);

Why do I get thoose Errors and how can i fix them?

 

you never initialized LoadedMods Variable

Code (CSharp):

1. public Dictionary<string, string> LoadedMods = new Dictionary<string, string>();

 

Thanks, me idiot ...