Object reference not set to an istance of an object

Hi there,

yesterday i saved the game, today i cant open it and i get this message.

After pressing Enter while receiving the message as a critical error the menu has no audio

Platform Win 10 Home
64bit
16 GB Ram
i7 6700
GTX 1080 TI

Gamevers: 2.1.0f4

conquest of aurelis level 20_20221005220617
conquest of aurelis level 20_20221005220617.meta

Do you have any ideas?

Thank you!