# Roof editing causes error

**URL:** <https://discourse.stonehearth.net/t/roof-editing-causes-error/15701>\
**Category:** Previous Build Reports\
**Created:** [August 20, 2015, 12:46am UTC](https://discourse.stonehearth.net/t/roof-editing-causes-error/15701 "2015-08-20T00:46:24Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![randomofamber](https://avatars.discourse-cdn.com/v4/letter/r/ba9def/32.png) [@randomofamber](https://discourse.stonehearth.net/u/randomofamber)\
**Post date:** [August 20, 2015, 12:46am UTC](https://discourse.stonehearth.net/t/roof-editing-causes-error/15701/1 "2015-08-20T00:46:24Z")

</div>

My id is: 6e3ac5c0-a4b4-11e4-bbb9-00e04c68007a

I get this error when attempting to edit the roof of a pre-saved design in any manner.

Here is the error:

release-453 (x64)stonehearth/lib/build\_util.luac:277: assertion failed!stack traceback:  
[C]: ?  
[C]: in function 'assert’  
stonehearth/lib/build\_util.luac:277: in function 'create\_edge\_loop\_for\_wall’  
stonehearth/lib/build\_util.luac:280: in function 'create\_edge\_loop\_for\_wall’  
stonehearth/lib/build\_util.luac:308: in function ‘calculate\_roof\_shape\_around\_walls’  
…h/services/client/build\_editor/grow\_roof\_editor.luac:48: in function ‘\_compute\_roof\_region’  
…h/services/client/build\_editor/grow\_roof\_editor.luac:31: in function ‘\_filter\_fn’  
…earth/services/client/selection/entity\_selector.luac:52: in function ‘\_get\_selected\_entity’  
…earth/services/client/selection/entity\_selector.luac:70: in function ‘\_on\_mouse\_event’  
…earth/services/client/selection/entity\_selector.luac:80: in function '\_mouse\_cb’  
stonehearth/services/client/input/input\_capture.luac:26: in function '\_dispatch’  
stonehearth/services/client/input/input\_service.luac:14: in function '\_dispatch\_input’  
stonehearth/services/client/input/input\_service.luac:1: in function \<stonehearth/services/client/input/input\_service.luac:1\>