Hi Batiste. I’m one of the authors of the TBD gem/measure. Not sure if you’ve managed to fix your issue (since Sep 5). From the OSW feedback you sent, one of TBD’s dependencies (Topolys) has “raised” an invalid sequence of vertices (‘recalculate’ method in the Wire class … see here). We have not come across this before. I’m leaning towards an invalid sequence of surface vertices in OpenStudio. I can look into it if you send me the .osm file. PS: I came across your post by accident - we do check UnmetHours (UMH) postings almost daily - next time maybe try there as well