Skeletron sans
Terrarian
I actually having the EXACT poblem
still doesnt work tho i have repaired all that supports TerrariaFIXED.
Playing Terraria 1.3 now
What worked for me:
Control Panel ==> Programs and Features
Find "Microsoft .NET Framework 4.5.2"
Right click ==> Uninstall/Change
Choose "Repair .NET Framework 4.5.2 to its original state"
Let it finish and restart the computer.
(Source: 4 Ways to Repair or Remove Microsoft .NET Framework • Raymond.CC)