Objects disappereance during game opening

Hi,

I have an issue with one of my games. I lauch the game and all objects are gone. Specifically raw materials such as log, gold, and so on. Some others craftables items are also missing. But I still have chests, beehives, alchemy engine. 

I don't know why, because few days before, there were no problems. I don't know how to recover the game.

Lot of hours lost in this game if I can't find a solution ...

Thanks,

Bertrand