You do have harmony? Harmony must be above everything, even core. Also add hugslib, not neccecary for CE but still is neccecary for othrer mods, bellow the Royalty or core if no roylaty is present.
Also I higly reccomend NOT using simple sidearms and use Pocket Sand mod instead as it doesn't cause issues SS does. Also reccomend other vanilla expanded mods such as weapons and clothing. And armor. Very good, quality mods. Good hunting, mate!

PS - don't forget to set the loadouts for pawns so they pickup all the rifles, pistols, knives and grenades they need.