Please help me stop this dumb error

[True Killer of Worlds]

I seriously have no idea what the hell is causing this but would someone please help me how to get rid of it???

 

[jopojelly]

Basic tModLoader Usage FAQ

A mod to make and play Terraria mods. Supports Terraria 1.4 (and earlier) installations - tModLoader/tModLoader

github.com

 

[True Killer of Worlds]

Basic tModLoader Usage FAQ

A mod to make and play Terraria mods. Supports Terraria 1.4 (and earlier) installations - tModLoader/tModLoader

github.com

oh thanks