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Usually caused by a "Memory Out of Bounds" error. Ensure you are running the 64-bit version (which is standard for 1.4.4.9) and try disabling heavy shaders.

: Most major mods (like Calamity or Thorium) now target the 1.4.4.9 architecture. download tmodloader 1449 updated

With the update to the .NET 6/7 framework (introduced around this version cycle), some specific errors occur. Usually caused by a "Memory Out of Bounds" error