Error when loading game

Summary:
release-593 (x64)
…/fixture_fabricator/fixture_fabricator_component.lua:171: attempt to index local ‘building’ (a nil value)
stack traceback:
[C]: ?
…/fixture_fabricator/fixture_fabricator_component.lua:171: in function ‘_are_dependencies_satisfied’
…/fixture_fabricator/fixture_fabricator_component.lua:215: in function ‘_start_project’
…/fixture_fabricator/fixture_fabricator_component.lua:42: in function <…/fixture_fabricator/fixture_fabricator_component.lua:40>

release-593 (x64)
c++ exception: lua runtime error
stack traceback:

release-593 (x64)
…onehearth/components/building/building_component.lua:484: attempt to index local ‘entity’ (a nil value)
stack traceback:
radiant/modules/common.lua:237: in function 'report_traceback’
radiant/modules/common.lua:248: in function <radiant/modules/common.lua:242>
…onehearth/components/building/building_component.lua:484: in function ‘_trace_entity’
…onehearth/components/building/building_component.lua:174: in function ‘_restore_structure_traces’
…onehearth/components/building/building_component.lua:114: in function 'obj’
radiant/modules/events.lua:75: in function 'instance’
radiant/modules/events.lua:227: in function <radiant/modules/events.lua:221>
[C]: in function 'xpcall’
radiant/modules/common.lua:257: in function 'xpcall’
radiant/modules/events.lua:221: in function <radiant/modules/events.lua:187>

Steps to reproduce:

  1. Load game
  2. Move to building site

Expected Results:
No Error appear

Actual Results:
Error appear

Notes:

Attachments:

Version Number and Mods in use:
593 no mods

System Information:
I7 930
12g ram
Gtx 970