HIVE

Uhm, I fixed it by setting the version in settings.xml to 1.27.0.52240 but I think the other settings are still wrong.
At least, the custom natives arent created so the map opens the main menu instead.

Which SC version are you using? and which natives are you trying to use?

SC-version 1.2.4.0
Natives: GetMouseTerrainX(), GetMouseTerrainY(), but I intent to use more of the mouse natives.
This is the script I used: http://www.hiveworkshop.com/pastebin/7d9698c0ef9c18fcc4d74093c5cc29e76690/

That version is ancient. Use 4.0

It is the version that is included in JNGP 2.0
Will download and try 4.0.

EDIT: The game doesnt even start when I run Test map.
It does when SharpCraft is disabled.

Try running in debug mode and see what it says

http://i.imgur.com/pzyMPht.png

I reinstalled JNGP 2.0 which includes SharpCraft 4.0.
The map now attempts to start, but it gets aborted with the same error.

Try placing the SharpCraft files right next to war3.exe, not inside a sub-directory.