additional error message
additional error message

stiXits/demo_lod,stiXits/demo_lod,stiXits/demo_lod,stephde/CG2Uebung,stephde/CG2Uebung,stiXits/demo_ray,hpicgs/cg2sandbox,lanice/cg2sandbox,stephde/CG2Uebung,stiXits/demo_ray,lanice/cg2sandbox,lanice/cg2sandbox,hpicgs/cg2sandbox,stiXits/demo_ray