Error code anytime i make a family or a house.

This has been going on for months and idk if its just me or what, but anytime i make a family to move into a house the whole house disappears and my family disappears. I get the error code 123:259a6556:5e24aec7 . I play with mods and i thought deleting and disabling them would help but it does nothing. please fix this.