If the submodels use the line
0 !LDRAW_ORG Unofficial_Model
LPub treats the submodels as parts. Maybe that's causing the error. Just delete the line ore rename it. At least get rid of the "!LDRAW_ORG"
0 !LDRAW_ORG Unofficial_Model
LPub treats the submodels as parts. Maybe that's causing the error. Just delete the line ore rename it. At least get rid of the "!LDRAW_ORG"