Amnesia won't start - Exception access violation

[Madiela]

Hello!

I hope somebody can help me.
I've got Amnesia from Steam and it worked perfectly, but now I've installed some custom stories and now it doesn't work anymore.

I've got this message:
Amnesia.exe caused an Exception access violation in module Amnesia.exe at 0023:00518858.

In the hlp-file it says:
-------- BEGIN LOAD FROM C:\Users\\Documents/Amnesia/Main/custom/Pewdiepie's house/AutoSave_NULL_2013_3_16_16_35_13_0.sav ---------
LOADING SAVE GAME!
ERROR: Couldn't create script 'custom_stories/Pewdiepie's house/maps/inventory.hps'
ERROR: Inventory script 'custom_stories/Pewdiepie's house/maps/inventory.hps' not found!
ERROR: Couldn't create script 'custom_stories/Pewdiepie's house/maps/global.hps'
ERROR: Global script 'custom_stories/Pewdiepie's house/maps/global.hps' could not be created!
-------- Loading map 'map2.map' ---------
ERROR: Could not open binary file 'C:/Users/Downloads/Amnesia/Steam/steamapps/common/Amnesia The Dark Descent/custom_stories/Pewdiepie's house/Maps/map2.map_cache'
ERROR: Could not map cache file 'C:/Users/Downloads/Amnesia/Steam/steamapps/common/Amnesia The Dark Descent/custom_stories/Pewdiepie's house/Maps/map2.map'. MeshEntity Loading: 1319 ms
Primitive Loading: 427 ms
Decal Loading: 0 ms
Object Combining: 0 ms
Compilation: 11 ms
Combining: 519 ms
Sorting: 325 ms
Meshes: 14 ms
Bodies: 180 ms
Static Objects: 2277 ms
Entities: 5815 ms
Compilation: 20 ms
Total: 8174 ms
Meshes created: 39
Bodies created: 24
-------- Loading complete ---------
ERROR: Couldn't create ent file 'models/player/hands/hands.ent'

This custom story did work before, I just took it for testing.
Do I have to reinstall the game? And how can I do this without buying it again?

Thank you very much for your help!