I got a similar one just now. It happened as soon as I loaded a large world saved last year, which didn't have any kind of weather mod already. It does have a long list of other mods, but no overhaul mods. Many are QoL.
The mod Moweather Revival (1.1.1) caused a non-recoverable error.
Please report this error to the mod author.
Error while running event Moweather-Revival::on_tick (ID 0)
Moweather-Revival/control.lua:103: attempt to perform arithmetic on field 'W' (a nil value)
stack traceback:
Moweather-Revival/control.lua:103: in function 'CalculateValues'
Moweather-Revival/control.lua:56: in function 'd'
Moweather-Revival/mologiccore/eventmanage.lua:101: in function <Moweather-Revival/mologiccore/eventmanage.lua:99>