I saw a message with a problem, a person deleted it, he had a problem with the work of the calamity mod, I'll leave a couple of ways so that you could try to solve it yourself if such a problem arises)
If calamity does not work separately, then this is not the main thing, try clearing the mod logs
as follows:
Path: C:\Users\User\OneDrive\Documents\My Games\Terraria\ModLoader\Logs
If this did not help, try to completely delete the terraria folder from the documents and reinstall tmodloader, save the world and the character if you need it, after manipulations do not rush to install mods, first install calamity and, if everything works, install mods one by one.
I do not know of any other ways to solve this problem on my own.