# Water physics engine error

**URL:** <https://discourse.stonehearth.net/t/water-physics-engine-error/26486>\
**Category:** Other Reports\
**Tags:** duplicate\
**Created:** [November 1, 2016, 9:34pm UTC](https://discourse.stonehearth.net/t/water-physics-engine-error/26486 "2016-11-01T21:34:43Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Chad\_McAuliffe](https://avatars.discourse-cdn.com/v4/letter/c/6f9a4e/32.png) [@Chad\_McAuliffe](https://discourse.stonehearth.net/u/Chad_McAuliffe)\
**Post date:** [November 1, 2016, 9:34pm UTC](https://discourse.stonehearth.net/t/water-physics-engine-error/26486/1 "2016-11-01T21:34:43Z")

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attempted to dig a moat around my town and got this error. hope this helps:

release-687 (x64)[M]  
stonehearth/components/water/water\_component.lua:794: assertion failed!  
stack traceback:  
radiant/modules/common.lua:237: in function 'report\_traceback’  
radiant/modules/common.lua:248: in function \<radiant/modules/common.lua:242\>  
[C]: in function 'assert’  
stonehearth/components/water/water\_component.lua:794: in function '\_remove\_height’  
stonehearth/components/water/water\_component.lua:261: in function '\_remove\_water’  
stonehearth/components/water/water\_component.lua:473: in function ‘fill\_channel\_from\_water\_region’  
…hearth/services/server/hydrology/channel\_manager.lua:561: in function ‘callback\_fn’  
…hearth/services/server/hydrology/channel\_manager.lua:194: in function ‘each\_channel\_ascending’  
…hearth/services/server/hydrology/channel\_manager.lua:559: in function ‘fill\_channels\_to\_capacity’  
…arth/services/server/hydrology/hydrology\_service.lua:768: in function ‘\_on\_tick’  
…arth/services/server/hydrology/hydrology\_service.lua:52: in function ‘fn’  
…  
radiant/controllers/time\_tracker\_controller.lua:82: in function ‘set\_now’  
…hearth/services/server/calendar/calendar\_service.lua:379: in function ‘\_on\_event\_loop’  
…hearth/services/server/calendar/calendar\_service.lua:37: in function 'instance’  
radiant/modules/events.lua:291: in function \<radiant/modules/events.lua:285\>  
[C]: in function 'xpcall’  
radiant/modules/common.lua:257: 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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**Author:** ![jomaxro](https://sea2.discourse-cdn.com/flex022/user_avatar/discourse.stonehearth.net/jomaxro/32/47935_2.png) [@jomaxro](https://discourse.stonehearth.net/u/jomaxro)\
**Post date:** [November 1, 2016, 9:48pm UTC](https://discourse.stonehearth.net/t/water-physics-engine-error/26486/2 "2016-11-01T21:48:21Z")

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A post was merged into an existing topic: [[DEV-3030] Engine errors when making a river](https://discourse.stonehearth.net/t/dev-3030-engine-errors-when-making-a-river/23113)

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<div class="post-metadata">

**Author:** ![jomaxro](https://sea2.discourse-cdn.com/flex022/user_avatar/discourse.stonehearth.net/jomaxro/32/47935_2.png) [@jomaxro](https://discourse.stonehearth.net/u/jomaxro)\
**Post date:** [November 1, 2016, 9:48pm UTC](https://discourse.stonehearth.net/t/water-physics-engine-error/26486/3 "2016-11-01T21:48:21Z")

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