If its a beta, then there might be issues.
It could be other addons, the new beta patch if you have that, the mod itself, your PC... can't say for sure.
You can right click on "my computer" and go to "manage", then look under "System tools\Event viewer\application" and it will give you a report on what caused the crash. Its usually a vague error number or something that doesn't help, so if it does, type that in google and maybe someone else knows.