# Engine Error Error Pop-UP

**URL:** <https://discourse.stonehearth.net/t/engine-error-error-pop-up/31445>\
**Category:** Bug Reports\
**Tags:** building, a22r737\
**Created:** [July 31, 2017, 5:15pm UTC](https://discourse.stonehearth.net/t/engine-error-error-pop-up/31445 "2017-07-31T17:15:13Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![LeeJow](https://sea2.discourse-cdn.com/flex022/user_avatar/discourse.stonehearth.net/leejow/32/55785_2.png) [@LeeJow](https://discourse.stonehearth.net/u/LeeJow)\
**Post date:** [July 31, 2017, 5:15pm UTC](https://discourse.stonehearth.net/t/engine-error-error-pop-up/31445/1 "2017-07-31T17:15:13Z")

</div>

release-737 (x64)  
stonehearth/services/server/build/ladder\_builder.lua:280: assertion failed!  
stack traceback:  
radiant/modules/common.lua:245: in function 'report\_traceback’  
radiant/modules/common.lua:256: in function \<radiant/modules/common.lua:250\>  
[C]: in function 'assert’  
stonehearth/services/server/build/ladder\_builder.lua:280: in function '\_get\_climb\_to’  
stonehearth/services/server/build/ladder\_builder.lua:296: in function '\_update\_build\_mode’  
stonehearth/services/server/build/ladder\_builder.lua:180: in function 'add\_point’  
stonehearth/services/server/build/ladder\_manager.lua:49: in function 'request\_ladder\_to’  
stonehearth/services/server/build/build\_service.lua:1503: in function 'request\_ladder\_to’  
stonehearth/components/scaffolding/scaffolding.lua:526: in function 'request\_ladder’  
stonehearth/components/scaffolding/scaffolding.lua:571: in function 'request\_ladder\_to’  
stonehearth/components/scaffolding/scaffolding.lua:619: in function '\_update\_ladders’  
stonehearth/components/scaffolding/scaffolding.lua:310: in function ‘recalculate\_scaffolding\_blueprint’  
…hearth/services/server/build/scaffolding\_manager.lua:288: in function ‘\_process\_changes’  
…hearth/services/server/build/scaffolding\_manager.lua:278: in function 'obj’  
radiant/modules/events.lua:83: in function 'instance’  
radiant/modules/events.lua:291: in function \<radiant/modules/events.lua:285\>  
[C]: in function 'xpcall’  
radiant/modules/common.lua:265: in function 'xpcall’  
radiant/modules/events.lua:285: in function 'trigger’  
radiant/modules/events.lua:398: in function '\_trigger\_gameloop’  
radiant/modules/events.lua:446: in function '\_update’  
radiant/server.lua:61: in function \<radiant/server.lua:58\>

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<div class="post-metadata">

**Author:** ![Relyss](https://sea2.discourse-cdn.com/flex022/user_avatar/discourse.stonehearth.net/relyss/32/41785_2.png) [@Relyss](https://discourse.stonehearth.net/u/Relyss)\
**Post date:** [August 8, 2017, 7:00pm UTC](https://discourse.stonehearth.net/t/engine-error-error-pop-up/31445/2 "2017-08-08T19:00:45Z")

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@LeeJow do you know what was happening in the game when this error appeared?  
Was your building adjacent to a mountain or something?