Issue I need help!

[Elly :)]

So, I'm new to SMAPI and whenever I try to launch it it says
SMAPI failed to initialize: TypeInitializationException: The type initializer for 'HarmonyLib.HarmonySharedState' threw an exception.
---> TypeLoadException: Could not load type 'System.Diagnostics.StackFrame' from assembly 'System.Diagnostics.StackTrace, Version=5.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'.
at HarmonyLib.HarmonySharedState..cctor()
--- End of inner exception stack trace ---
at HarmonyLib.HarmonySharedState.GetPatchInfo(MethodBase method)
at HarmonyLib.PatchProcessor.Patch()
at MonoMod.Utils.MiniMonoModHotfix.Apply() in SMAPI\Framework\TemporaryHacks\MiniMonoModHotfix.cs:line 55
at StardewModdingAPI.Framework.SCore.RunInteractively() in SMAPI\Framework\SCore.cs:line 282

This is really annoying, I just want to mod my stardew :( If anyone can help id really appreciate it...

 

[DragonGwen]

Did you add content patcher? It looks like it can't load something (idk I'm not into code) and it helps meld mods together so that your game runs smoothly