Hello, new forum-goer!
First off, requests for help and support go
here, not in this part of the forum - usually a mod will move it, but let's not give them any extra work
I'm assuming you're using
this as a tutorial?
Make sure your custom story is in a folder in the custom_story folder in the redist (I've made that mistake before). Try to name it the same as your game ("The Dark House").
If that doesn't work, check that you've
set up a development environment. Particularly step 8:"In order to avoid running into “File index out of bounds” errors when designing your custom story in the level editor, edit the file resources.cfg located in the root the directory of Amnesia (i.e. where Amnesia is installed) and add the custom_stories directory to the list."
I hope that helps!