@MR_Yuki ,
The recent error was caused by the fact that you had missing adjacencies in the model. The source of this error was the fact that you added prefixes to the IDs of rooms after you solved adjacency. This resulted in the adjacent objects referencing surfaces that no longer existed in the model. If you are going to use the “HB Add Prefix” component, you should do so before you solve adjacencies. I just added a warning into the component so that we can hopefully prevent this case in the future:
It turns out that there wasn’t any bug in the AFN that I could recreate. So just add the prefix before you solve adjacency and everything should work.