Cannot Build and design a house!

I cannot seem to build in game. Affects both designing a custom building as well as building a pre-designed house.
Please note the problem is in the design phase of a custom building: for example I cannot lay foundations when I use the design tool.

The code is listed below when I try and build a pre-designed house:

develop-2998 (x64)
stonehearth/lib/build_util.lua:542: assertion failed!
stack traceback:
[C]: ?
[C]: in function 'assert’
stonehearth/lib/build_util.lua:542: in function 'unpack_entity_table’
stonehearth/components/floor/floor_component.lua:104: in function 'load_from_template’
stonehearth/lib/build_util.lua:112: in function 'load_structure_from_template’
stonehearth/lib/build_util.lua:120: in function 'load_all_structures_from_template’
stonehearth/lib/build_util.lua:124: in function 'load_all_structures_from_template’
stonehearth/lib/build_util.lua:434: in function 'restore_template’
stonehearth/services/server/build/build_service.lua:1503: in function 'build_template’
stonehearth/services/server/build/build_service.lua:1494: in function 'cb’
stonehearth/services/server/build/build_service.lua:1469: in function 'do_command’
stonehearth/services/server/build/build_service.lua:1493: in function <stonehearth/services/server/build/build_service.lua:1491


What predesigned house are you looking at? Is it a custom template you made yourself or something the game provided as a template? If it is a custom template, it’s possible that template has become corrupted somehow … (if so, please upload the template). If it is something that the game provided (like one of the ascendancy houses), please let me know which house.

Hi Yang,
It affects both custom and game provided templates. When I try and select a template and place it down on the ground it just disappears and the code that I posted pops up. Also I cannot do anything on the design builder itself - it just disappears when I try and place it on the ground too.


EDIT: I have figured out the problem.
It seems that if I try to build the custom file first it just causes the whole build tool to fail. However it works fine if I just don’t try and build the custom template.
I hadn’t realised this earlier and so always tried to build the custom first.