Bug [develop-2494 (x64)] latest version 14-7-2015

[miturion]

With a microworld and the updated version of v0.8.0 (updated by mincrmatt12) on the latest steam beta branch develop-2494 (x64) (14-7-2015)
I get this error as soon as I started the microworld.

develop-2494 (x64)
...earth/services/server/calendar/calendar_service.luac:69: assertion failed!
stack traceback:
[C]: ?
[C]: in function 'assert'
...earth/services/server/calendar/calendar_service.luac:69: in function '_create_timer'
...earth/services/server/calendar/calendar_service.luac:56: in function 'set_interval'
...calmod/components/wind_sail/wind_sail_component.luac:24: in function <...calmod/components/wind_sail/wind_sail_component.luac:10>

I have put the mod files I play with in the download link, together with the save file and the stonehearth.log

https://drive.google.com/folderview?id=0B0JhuggbnqMZNF9PU0Z2UVRvTE0&usp=sharing