House customization problem

hi all, when i go to commit in the menu i get the message illegal floor! . i have no orange tiles or anything bad like that, but cant seem to get this house to go through. anyone know what this could be ?
 

Karl Sagan

Grandmaster
There's a bad floor tile. Try going floor by floor and making the walls transparent/invisible. Fucky floor tiles always hiding behind walls/steps.
 
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