I'm getting an error. Also the map cannot be generated, and there is a conflict with Map Preview.

Error while instantiating a mod of type KurasStones.StonesMod: System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> HarmonyLib.HarmonyException: Patching exception in method null ---> System.ArgumentException: Undefined target method for patch method static System.Void KurasStones.World_NaturalRockTypesIn::PostFix(System.Int32 tile, System.Collections.Generic.IEnumerable`1& __result)
[Ref 9F468612]
at HarmonyLib.PatchClassProcessor.PatchWithAttributes (System.Reflection.MethodBase& lastOriginal, System.Boolean unpatch) [0x00047] in <8124cc12bdf242eab0a5f7e7edecf387>:0
at HarmonyLib.PatchClassProcessor.Patch () [0x0006e] in <8124cc12bdf242eab0a5f7e7edecf387>:0
--- End of inner exception stack trace ---
[Ref F8388905]
at HarmonyLib.PatchClassProcessor.ReportException (System.Exception exception, System.Reflection.MethodBase original) [0x00154] in <8124cc12bdf242eab0a5f7e7edecf387>:0
at HarmonyLib.PatchClassProcessor.Patch () [0x000a0] in <8124cc12bdf242eab0a5f7e7edecf387>:0
at HarmonyLib.Harmony.<PatchAll>b__10_0 (System.Type type) [0x00007] in <8124cc12bdf242eab0a5f7e7edecf387>:0
at HarmonyLib.CollectionExtensions.Do[T] (System.Collections.Generic.IEnumerable`1[T] sequence, System.Action`1[T] action) [0x00014] in <8124cc12bdf242eab0a5f7e7edecf387>:0
at HarmonyLib.Harmony.PatchAll (System.Reflection.Assembly assembly) [0x00006] in <8124cc12bdf242eab0a5f7e7edecf387>:0
<0x219d59bca00 + 0x000fa> <unknown method>
(wrapper managed-to-native) System.Reflection.RuntimeConstructorInfo.InternalInvoke(System.Reflection.RuntimeConstructorInfo,object,object[],System.Exception&)
at System.Reflection.RuntimeConstructorInfo.InternalInvoke (System.Object obj, System.Object[] parameters, System.Boolean wrapExceptions) [0x00005] in <51fded79cd284d4d911c5949aff4cb21>:0
--- End of inner exception stack trace ---
[Ref 88615891]
at System.Reflection.RuntimeConstructorInfo.InternalInvoke (System.Object obj, System.Object[] parameters, System.Boolean wrapExceptions) [0x0001a] in <51fded79cd284d4d911c5949aff4cb21>:0
at System.Reflection.RuntimeConstructorInfo.DoInvoke (System.Object obj, System.Reflection.BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) [0x00086] in <51fded79cd284d4d911c5949aff4cb21>:0
at System.Reflection.RuntimeConstructorInfo.Invoke (System.Reflection.BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) [0x00000] in <51fded79cd284d4d911c5949aff4cb21>:0
at System.RuntimeType.CreateInstanceImpl (System.Reflection.BindingFlags bindingAttr, System.Reflection.Binder binder, System.Object[] args, System.Globalization.CultureInfo culture, System.Object[] activationAttributes, System.Threading.StackCrawlMark& stackMark) [0x0022b] in <51fded79cd284d4d911c5949aff4cb21>:0
at System.Activator.CreateInstance (System.Type type, System.Reflection.BindingFlags bindingAttr, System.Reflection.Binder binder, System.Object[] args, System.Globalization.CultureInfo culture, System.Object[] activationAttributes) [0x0009c] in <51fded79cd284d4d911c5949aff4cb21>:0
at System.Activator.CreateInstance (System.Type type, System.Object[] args) [0x00000] in <51fded79cd284d4d911c5949aff4cb21>:0
at Verse.LoadedModManager.CreateModClasses () [0x00085] in <7a4ff24096e646578ec80b030e4544b3>:0
UnityEngine.StackTraceUtility:ExtractStackTrace ()
Verse.Log:Error (string)
Verse.LoadedModManager:CreateModClasses ()
Verse.LoadedModManager:LoadAllActiveMods (bool)
Verse.PlayDataLoader:DoPlayLoad ()
Verse.PlayDataLoader:LoadAllPlayData (bool)
Verse.Root/<>c:<Start>b__10_1 ()
Verse.LongEventHandler:RunEventFromAnotherThread (System.Action)
Verse.LongEventHandler/<>c:<UpdateCurrentAsynchronousEvent>b__28_0 ()
System.Threading.ThreadHelper:ThreadStart_Context (object)
System.Threading.ExecutionContext:RunInternal (System.Threading.ExecutionContext,System.Threading.ContextCallback,object,bool)
System.Threading.ExecutionContext:Run (System.Threading.ExecutionContext,System.Threading.ContextCallback,object,bool)
System.Threading.ExecutionContext:Run (System.Threading.ExecutionContext,System.Threading.ContextCallback,object)
System.Threading.ThreadHelper:ThreadStart ()