Engine error when placing roof on blueprint

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Summary:
Engine error when placing roof on blueprint

Steps to reproduce:

  1. Load the save
  2. Enter building editing mode
  3. Use the roof tool to place a roof in the walls that are without roofs

Expected Results:

Roof placed.

Actual Results:

Engine error shows up

Notes:

Attachments:

Error traceback: stonehearth_engine_error_while_placing_roof.txt · GitHub

Save: Dropbox - Link not found

Blueprint screenshot: http://images.akamai.steamusercontent.com/ugc/449617453809237359/79335F8D604983D0B7258BE64F58C12FFC11DF35/

Version Number and Mods in use: 0.17.0 r610 x64 build

System Information: