The first step is to see if there's any DB tables that both Darthmod and my mod contain. If there is then this is most likely causing the conflict. You'll either need to merge these DB tables together or delete one of them (I don't recommend the latter option as it may cause problems).

For the second step I'd recommend checking that my mod will load without Darthmod. Some people have been having problems with this mod and it may be because there's so many new factions (the extra diplomacy makes the startpos much larger). Try reducing the graphic setting and seeing if this helps.

I don't really have any other suggestions as I have no way of determining why my mod doesn't load for some people.