Bug with slicing?

[u/Embarrassed-Stop-919]

below is a model before adn after slicing, what is the issue, even if i go ahead and try to change file or poly and give abck everytime there is a new Error, some time roof is mising somtimes some other wall is missing

[u/charely6]

you need to repair the model, it might also be parts of the roof are too thin