Error on Startup

Error in Integrated Implants, assembly name: Implants, method: LTS_HediffComp_Dreadheart:GenerateFleshBeastSpawnList, exception: System.MissingFieldException: Field not found: System.Collections.Generic.List`1<Verse.PawnKindDef> RimWorld.FleshbeastUtility.AllFleshbeasts Due to: Could not find field in class
[Ref 52CFC3A4]
(wrapper managed-to-native) System.Reflection.RuntimeModule.ResolveFieldToken(intptr,int,intptr[],intptr[],System.Reflection.ResolveTokenError&)
  at System.Reflection.RuntimeModule.ResolveField (System.Reflection.Module module, System.IntPtr monoModule, System.Int32 metadataToken, System.Type[] genericTypeArguments, System.Type[] genericMethodArguments) [0x0000f] in <51fded79cd284d4d911c5949aff4cb21>:0
  at System.Reflection.RuntimeModule.ResolveField (System.Int32 metadataToken, System.Type[] genericTypeArguments, System.Type[] genericMethodArguments) [0x00000] in <51fded79cd284d4d911c5949aff4cb21>:0
  at HarmonyLib.MethodBodyReader.ReadOperand (HarmonyLib.ILInstruction instruction) [0x003de] in <8124cc12bdf242eab0a5f7e7edecf387>:0
  at HarmonyLib.MethodBodyReader.GenerateInstructions () [0x00022] in <8124cc12bdf242eab0a5f7e7edecf387>:0
<0x281c63720f0 + 0x0014a> <unknown method>
  at HarmonyLib.MethodCopier.GetInstructions (System.Reflection.Emit.ILGenerator generator, System.Reflection.MethodBase method, System.Int32 maxTranspilers) [0x00024] in <8124cc12bdf242eab0a5f7e7edecf387>:0
  at HarmonyLib.PatchProcessor.GetOriginalInstructions (System.Reflection.MethodBase original, System.Reflection.Emit.ILGenerator generator) [0x0000b] in <8124cc12bdf242eab0a5f7e7edecf387>:0
  at ModErrorChecker.ModErrorChecker.CheckAssemblies () [0x000af] in <c01cefb11f204c02a513919b7c43f698>:0
UnityEngine.StackTraceUtility:ExtractStackTrace ()
(wrapper dynamic-method) MonoMod.Utils.DynamicMethodDefinition:Verse.Log.Error_Patch1 (string)
ModErrorChecker.ModErrorChecker/<StartChecks>d__1:MoveNext ()
System.Runtime.CompilerServices.AsyncMethodBuilderCore/MoveNextRunner:InvokeMoveNext (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.Runtime.CompilerServices.AsyncMethodBuilderCore/MoveNextRunner:Run ()
System.Threading.Tasks.SynchronizationContextAwaitTaskContinuation/<>c:<.cctor>b__7_0 (object)
UnityEngine.UnitySynchronizationContext/WorkRequest:Invoke ()
UnityEngine.UnitySynchronizationContext:Exec ()
UnityEngine.UnitySynchronizationContext:ExecuteTasks ()