I have encountered an error, it seems, because TModLoader has updated:
[23:02:48.876] [.NET ThreadPool Worker/ERROR] [tML]: An error occurred while loading ThoriumMod v1.7.1.2
It has been detected that this mod was built for tModLoader v2023.6.25.31
However, you are using tModLoader v2023.8.3.0...