Error with building

so i was in the middle of making my town when all the sudden i get a messup error when building and now every time i start the world save i get this error. also some areas the hearthlings seem confused or dont more something at all to were i want it like the stone masons stuff.

release-549 (x64)…onehearth/components/building/building_component.lua:313: attempt to index local ‘entity’ (a nil value)stack traceback:
radiant/modules/common.lua:223: in function ‘report_traceback’
radiant/modules/common.lua:234: in function <radiant/modules/common.lua:228>
…onehearth/components/building/building_component.lua:313: in function ‘_trace_entity’
…onehearth/components/building/building_component.lua:123: in function ‘_restore_structure_traces’
…onehearth/components/building/building_component.lua:77: in function ‘obj’
radiant/modules/events.lua:73: in function ‘instance’
radiant/modules/events.lua:206: in function <radiant/modules/events.lua:200>
[C]: in function ‘xpcall’
radiant/modules/common.lua:243: in function ‘xpcall’
radiant/modules/events.lua:200: in function <radiant/modules/events.lua:171>

and at the same time some buildings seem to casue more errors

world save → https://drive.google.com/file/d/0B4ZNJDO5qt8IRC1GbEpEYTNLUU0/view?usp=sharing
Blueprint that i think is the cause → https://drive.google.com/file/d/0B4ZNJDO5qt8IdGRNaXdRMjBrRTA/view?usp=sharing

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