I guess this problem solved itself now.
After clicking "ignore" i got the message, that the save is from an older version and that its been updated. Now i dont get errors anymore.
But just in case, here is the save:
https://mega.nz/file/8WADACoK#SmVRbtMpM5FIePSzjXLPPF-B0iG6b2v3q_HaY0BJKUM