tModLoader Loading problems with "big" mods

[H1karo]

Hey guys
I've got a problem with some mods, that add a lot of content like Thorium, Calamity, Tremor, etc.
When I load them, a window pops up and it reads:

(Original)
Der Objektverweis wurde nicht auf eine Objektinstanz festgelegt.
bei EnemyMods.NPCs.gNPC.SetDefaults(NPC npc) in C:\Users\Kenneth\Documents\My Games\Terraria/ModLoader\Mod Sources\EnemyMods\NPCs\gNPC.cs:Zeile 70.
bei Terraria.ModLoader.NPCLoader.SetDefaults(NPC npc, Boolean createModNPC)
bei Terraria.ModLoader.Mod.SetupContent()
bei Terraria.ModLoader.ModLoader.do_Load(Object threadContext)

(Translated)
The object reference could not be set to an object instance.
at EnemyMods.NPCs.gNPC.SetDefaults(NPC npc) in C:\Users\Kenneth\Documents\My Games\Terraria/ModLoader\Mod Sources\EnemyMods\NPCs\gNPC.cs:Line 70.
at Terraria.ModLoader.NPCLoader.SetDefaults(NPC npc, Boolean createModNPC)
at Terraria.ModLoader.Mod.SetupContent()
at Terraria.ModLoader.ModLoader.do_Load(Object threadContext)

this directory (C:\Users\Kenneth\Documents\My Games\Terraria/ModLoader\Mod Sources\EnemyMods\NPCs\gNPC) doesn't even exist on my computer. this is where the file should be:
C:\Users\ralfs\Documents\My Games\Terraria\ModLoader\Mod Sources

but in that last folder, there isn't anything.
I would appreciate if someone could help me with this
and I hope that my english is understandable