[Dup] [Develop - 2494] Error in relation with ladders

Every time I load my save this error appears :

develop-2494 (x64)
...tonehearth/services/server/build/ladder_builder.luac:11: attempt to index local 'ladder' (a nil value)
stack traceback:
	radiant/modules/events.luac:68: in function <radiant/modules/events.luac:65>
	...tonehearth/services/server/build/ladder_builder.luac:11: in function 'self'
	radiant/modules/events.luac:80: in function <radiant/modules/events.luac:78>
	[C]: in function 'xpcall'
	radiant/modules/events.luac:78: in function <radiant/modules/events.luac:70>

It’s in relation with ladders, of course, which I use a lot. But I don’t really know how and when the error appears the first time.

EDIT : Another one just appears, but still don’t know how…

develop-2494 (x64)
...tonehearth/services/server/build/ladder_builder.luac:11: attempt to index local 'ladder' (a nil value)
stack traceback:
	radiant/modules/events.luac:68: in function <radiant/modules/events.luac:65>
	...tonehearth/services/server/build/ladder_builder.luac:11: in function 'self'
	radiant/modules/events.luac:80: in function <radiant/modules/events.luac:78>
	[C]: in function 'xpcall'
	radiant/modules/events.luac:78: in function <radiant/modules/events.luac:70>

develop-2494 (x64)
stonehearth/components/water/water_component.luac:83: assertion failed!
stack traceback:
	radiant/modules/common.luac:32: in function <radiant/modules/common.luac:32>
	[C]: in function 'assert'
	stonehearth/components/water/water_component.luac:83: in function '_grow_region'
	stonehearth/components/water/water_component.luac:57: in function '_add_water'
	...rth/services/server/hydrology/hydrology_service.luac:175: in function 'add_water'
	...rth/services/server/hydrology/hydrology_service.luac:240: in function '_process_water_queue'
	...rth/services/server/hydrology/hydrology_service.luac:237: in function '_on_tick'
	...rth/services/server/hydrology/hydrology_service.luac:13: in function '_fn'
	radiant/controllers/timer_controller.luac:28: in function 'fire'
	radiant/controllers/time_tracker_controller.luac:9: in function <radiant/controllers/time_tracker_controller.luac:9>
	[C]: in function 'xpcall'
	radiant/controllers/time_tracker_controller.luac:9: in function 'set_now'
	...earth/services/server/calendar/calendar_service.luac:112: in function 'fn'
	radiant/modules/events.luac:79: in function <radiant/modules/events.luac:78>
	[C]: in function 'xpcall'
	radiant/modules/events.luac:78: in function 'trigger'
	radiant/modules/events.luac:97: in function '_update'
	radiant/server.luac:19: in function <radiant/server.luac:17>

I moved a post to an existing topic: Rest in Peace my save :confused: (infinite errors about nil ladder)