"Could not find data folder..."

[Sanai]

Hello forum
I tried to start with making custom maps, but i have a problem, if i wanna open the Map-file.
I get few error, which says me, that folders can't be found.
Then the mapeditor opens with a blackscreen and shows me the message:
"FATAL ERROR: Could not load vertex buffer from mesh 'core_box.dae'.
If i klick ok, the programm close.

Hopefully you can help me and excuse my bad english

[EXAWOLT]

are all the files from HLP2 un-zipped on the right place?

[Kazakarumariou]

AKA /\
extract EVERY file from the hpl editor into amnesia the dark descent folder.

[Sanai]

Yes, i've done it.
Ok, it's was my fail, i tried to open the map with a doubleclick....