If the editor crashes on startup, then it's a wrong configuration, most likely wrong directories. Delete the config in the editor's directory, I think it's Config.xml and restart the editor, enter correct paths then. There are several threads describing that, probably somewhere in the stickies.
If the editor crashes when you load the mod, then there's probably a typo somewhere in the stat files. Happened to me a couple of times that the editor crashed when loading my mod.
It's usually then that a stat entry has a typo or the type is missing.
Example, the sheep shears have the following stats
new entry "TOOL_Shears_A"
type "Weapon"
using "_Daggers"
data "Act part" "1"
data "Requirements" "Dexterity 5"
data "Damage" "1"
data "Value" "1"
Now, the included _Daggers would already contain the 'type "Weapon"'. Still the editor crashes when it's missing or when there's a typo in the 'type' line. (I make changes in a text editor because I don't have Excel, but of course that is dangerous...)
Would require an answer from Larian why a missing line causes a crash when it could be taken from the include, but it is how it is. You know it now and have a starting point to search for errors.