[Personal Marketplace] ERROR: Failed to apply Harmony patches:

Hi,

getting this error.

[Personal Marketplace] ERROR: Failed to apply Harmony patches: HarmonyLib.HarmonyException: Patching exception in method null ---> System.ArgumentException: Undefined target method for patch method static System.Void Oxide.Plugins.MutateItemPatch::Prefix(ProtoBuf.Item item, Network.Connection connection, ItemDefinition& __state)
  at HarmonyLib.PatchClassProcessor.PatchWithAttributes (System.Reflection.MethodBase& lastOriginal) [0x00047] in <6c906b4f1de440f3a86cb0ebb3f48ea6>:0 
  at HarmonyLib.PatchClassProcessor.Patch () [0x0006e] in <6c906b4f1de440f3a86cb0ebb3f48ea6>:0 
   --- End of inner exception stack trace ---
  at HarmonyLib.PatchClassProcessor.ReportException (System.Exception exception, System.Reflection.MethodBase original) [0x00154] in <6c906b4f1de440f3a86cb0ebb3f48ea6>:0 
  at HarmonyLib.PatchClassProcessor.Patch () [0x0009e] in <6c906b4f1de440f3a86cb0ebb3f48ea6>:0 
  at HarmonyLib.Harmony.<PatchAll>b__10_0 (System.Type type) [0x00007] in <6c906b4f1de440f3a86cb0ebb3f48ea6>:0 
  at HarmonyLib.CollectionExtensions.Do[T] (System.Collections.Generic.IEnumerable`1[T] sequence, System.Action`1[T] action) [0x00014] in <6c906b4f1de440f3a86cb0ebb3f48ea6>:0 
  at HarmonyLib.Harmony.PatchAll (System.Reflection.Assembly assembly) [0x00006] in <6c906b4f1de440f3a86cb0ebb3f48ea6>:0 
  at Oxide.Plugins.PersonalMarketplace.ApplyHarmonyPatches () [0x00025] in <52265ce126a24accbc10ed9ed78c8c8b>:0