# Merge Blueprints Error

**URL:** <https://discourse.stonehearth.net/t/merge-blueprints-error/18121>\
**Category:** Resolved Reports\
**Tags:** resolved\
**Created:** [November 28, 2015, 10:48pm UTC](https://discourse.stonehearth.net/t/merge-blueprints-error/18121 "2015-11-28T22:48:00Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![Averest](https://sea2.discourse-cdn.com/flex022/user_avatar/discourse.stonehearth.net/averest/32/47783_2.png) [@Averest](https://discourse.stonehearth.net/u/Averest)\
**Post date:** [November 28, 2015, 10:48pm UTC](https://discourse.stonehearth.net/t/merge-blueprints-error/18121/1 "2015-11-28T22:48:00Z")

</div>

As far as I can recall, I was removing two objects that were directly next to each other and they were both made from slabs because I wanted to get them to merge into one item. Now it seems the game can’t build anything but prefabs.  
Here are the error logs:

1/5

> ```
> > develop-2720 (x64)stonehearth/services/server/build/build_service.luac:149: attempt to index local 'building' (a nil value)stack traceback:
> > [C]: ?
> > stonehearth/services/server/build/build_service.luac:149: in function '_merge_blueprints_into'
> > stonehearth/services/server/build/build_service.luac:91: in function '_add_floor_type'
> > stonehearth/services/server/build/build_service.luac:81: in function 'add_floor'
> > stonehearth/services/server/build/build_service.luac:50: in function 'cb'
> > stonehearth/services/server/build/build_service.luac:304: in function 'do_command'
> > stonehearth/services/server/build/build_service.luac:50: in function <stonehearth/services/server/build>/build_service.luac:49>
> 
> ```

2/5  
`> develop-2720 (x64)c++ exception: lua runtime errorstack traceback:`

3/5

> develop-2720 (x64)…hearth/services/server/build/build\_undo\_manager.luac:6: assertion failed!stack traceback:  
> [C]: ?  
> [C]: in function ‘assert’  
> …hearth/services/server/build/build\_undo\_manager.luac:6: in function ‘begin\_transaction’  
> stonehearth/services/server/build/build\_service.luac:303: in function ‘do\_command’  
> stonehearth/services/server/build/build\_service.luac:50: in function \<stonehearth/services/server/build/build\_service.luac:49\>

4/5

```
> develop-2720 (x64)...hearth/services/server/build/build_undo_manager.luac:108: assertion failed!stack traceback:
> radiant/modules/events.luac:84: in function <radiant/modules/events.luac:81>
> [C]: in function 'assert'
> ...hearth/services/server/build/build_undo_manager.luac:108: in function 'clear'
> stonehearth/services/server/build/build_service.luac:35: in function 'clear_undo_stack'
> stonehearth/services/server/build/build_service.luac:37: in function 'set_active'
> ...earth/services/server/build/scaffolding_manager.luac:130: in function '_create_scaffolding_for'
> ...earth/services/server/build/scaffolding_manager.luac:97: in function '_process_new_regions'
> ...earth/services/server/build/scaffolding_manager.luac:93: in function 'method'
> radiant/modules/events.luac:43: in function 'instance'
> radiant/modules/events.luac:98: in function <radiant/modules/events.luac:96>
> [C]: in function 'xpcall'
> radiant/modules/events.luac:96: in function 'trigger'
> radiant/modules/events.luac:121: in function '_trigger_gameloop'
> radiant/modules/events.luac:150: in function '_update'
> radiant/server.luac:19: in function <radiant/server.luac:17>

```

5/5

```
develop-2720 (x64)...earth/services/server/build/scaffolding_manager.luac:95: assertion failed!stack traceback:
	radiant/modules/events.luac:84: in function <radiant/modules/events.luac:81>
	[C]: in function 'assert'
	...earth/services/server/build/scaffolding_manager.luac:95: in function '_process_new_regions'
	...earth/services/server/build/scaffolding_manager.luac:93: in function 'method'
	radiant/modules/events.luac:43: in function 'instance'
	radiant/modules/events.luac:98: in function <radiant/modules/events.luac:96>
	[C]: in function 'xpcall'
	radiant/modules/events.luac:96: in function 'trigger'
	radiant/modules/events.luac:121: in function '_trigger_gameloop'
	radiant/modules/events.luac:150: in function '_update'
	radiant/server.luac:19: in function <radiant/server.luac:17>

```

Hope it helps