Im having trouble launching tmodloader for some reason, happened randomly

Attempt to Port from "C:/Users/barri\Documents\My Games\Terraria\tModLoader" to "C:/Users/barri\Documents\My Games\Terraria\tModLoader-1.4.3" aborted, the "C:/Users/barri\Documents\My Games\Terraria\tModLoader\config.json" file is corrupted.

tModLoader.ModExceptionHint

System.NullReferenceException: Object reference not set to an instance of an object.
at Terraria.Program.PortFilesFromXtoY(String superSavePath, String source, String destination, String maxVersionOfSource, Boolean isCloud, Boolean isAtomicLockable) in tModLoader\Terraria\Program.TML.cs:line 166

This is the crash log I think
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