Lua NPC ERROR

[Kayhend]

I'm starting with a 7.6 server, and downloaded the Avesta74, and the compiler wasn't working, so i downloaded a TFS, and i changed the files, but i get this error, with a bunch of another ones.

Once i solve this, i can solve the rest, so HELP ME!!

[26/06/2015 19:47:20] data/npc/lib/npc.lua:2: attempt to call global 'getDataDir' (a nil value)

 

[Baahzera]

Please check your NPC lib for the getDataDir function called in line 2 of npc.lua.
This function may not exist or it's buggy.