This mod currently fails on a validation check with the latest OXCE ( My reference version is 7.5.8 )
Just replace the file
LandOfSand/Ruleset/Armors-LandOfSand.rul with the attached one to this post.
STR_NONE_UC was disabled by a STR_NOT_AVAILABLE soldier type which the game crashed on, now STR_NONE_UC is simply deleted.