Needing help with roofs

ive been having some problems with roofs lately
I have an outline that I like for how I want to set it up but it wont let me build a roof on it.
I have tried this with different houses and setups with not one that would let me place a roof

tried using foundations and slabs as a base since I wanted to have some houses that looked like they had a deck

im I missing a step to get a roof?

As far as I know roofs can only be placed on top of walls, house or free standing. They can not be placed on top of slabs. Is that your case?

Have fun, Kyth.

the walls are still on top of the slabs or foundation but some of my designs do have a lot of coloums to them. could that be part of the problem?

I loaded the gave up again and I got this message after going to the build option:
develop-3169 (x64)
stonehearth/lib/build_util.lua:871: assertion failed!
stack traceback:
[C]: ?
[C]: in function 'assert’
stonehearth/lib/build_util.lua:871: in function 'create_edge_loop_for_wall’
stonehearth/lib/build_util.lua:958: in function ‘calculate_roof_shape_around_walls’
…th/services/client/build_editor/grow_roof_editor.lua:116: in function ‘_compute_roof_region’
…th/services/client/build_editor/grow_roof_editor.lua:78: in function ‘fn’
…ces/client/selection/entity_or_location_selector.lua:233: in function ‘_get_selected_entity’
…ces/client/selection/entity_or_location_selector.lua:269: in function ‘_on_mouse_event’
…nehearth/services/client/selection/selector_base.lua:115: in function '_mouse_cb’
stonehearth/services/client/input/input_capture.lua:55: in function '_dispatch’
stonehearth/services/client/input/input_service.lua:70: in function '_dispatch_input’
stonehearth/services/client/input/input_service.lua:12: in function <stonehearth/services/client/input/input_service.lua:11>

Hey,

Could you provide us with a print screen of the building, or maybe a save too for the devs, As said, roofs don’t work on slabs but should work on the wall tool,

https://drive.google.com/drive/folders/0B0Pj1xRD4jFxbGZQcXpEQ0I1UW8?usp=sharing
https://drive.google.com/drive/folders/0B0Pj1xRD4jFxaVVaelh4YVJrQXc?usp=sharing

there are the save and templates one of them I made a slab roof but the downside on that one is that you cant see thought it too well

I tried a roof even with no floor or slabs and it will would not work at all