[Error  :     R2API] ItemDropAPI could not be initialized and has been disabled:

System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> System.InvalidCastException: Specified cast is not valid.
  at R2API.Utils.Reflection.ReadLocalIndex (Mono.Cecil.Cil.OpCode opCode, System.Object operand) [0x0008a] in <867463b4f9ea441bba7a8dc2a6baea57>:0
  at R2API.ItemDropAPI.DropRewards (MonoMod.Cil.ILContext il) [0x000d5] in <867463b4f9ea441bba7a8dc2a6baea57>:0
  at MonoMod.Cil.ILContext.Invoke (MonoMod.Cil.ILContext+Manipulator manip) [0x00087] in <014070a30c9a42e3becb67d17f0aa813>:0
  at MonoMod.RuntimeDetour.ILHook+Context.InvokeManipulator (Mono.Cecil.MethodDefinition def, MonoMod.Cil.ILContext+Manipulator cb) [0x00012] in <454c317a535d48e898e657206da1cf99>:0
  at MonoMod.RuntimeDetour.ILHook+Context.Refresh () [0x000ea] in <454c317a535d48e898e657206da1cf99>:0
  at MonoMod.RuntimeDetour.ILHook.Apply () [0x00059] in <454c317a535d48e898e657206da1cf99>:0
  at MonoMod.RuntimeDetour.ILHook..ctor (System.Reflection.MethodBase from, MonoMod.Cil.ILContext+Manipulator manipulator, MonoMod.RuntimeDetour.ILHookConfig& config) [0x00140] in <454c317a535d48e898e657206da1cf99>:0
  at MonoMod.RuntimeDetour.ILHook..ctor (System.Reflection.MethodBase from, MonoMod.Cil.ILContext+Manipulator manipulator, MonoMod.RuntimeDetour.ILHookConfig config) [0x00000] in <454c317a535d48e898e657206da1cf99>:0
  at MonoMod.RuntimeDetour.ILHook..ctor (System.Reflection.MethodBase from, MonoMod.Cil.ILContext+Manipulator manipulator) [0x0001c] in <454c317a535d48e898e657206da1cf99>:0
  at MonoMod.RuntimeDetour.HookGen.HookEndpoint._NewILHook (System.Reflection.MethodBase from, MonoMod.Cil.ILContext+Manipulator to) [0x00000] in <454c317a535d48e898e657206da1cf99>:0
  at MonoMod.RuntimeDetour.HookGen.HookEndpoint._Add[TDelegate] (System.Func`3[T1,T2,TResult] gen, TDelegate hookDelegate) [0x0003c] in <454c317a535d48e898e657206da1cf99>:0
  at MonoMod.RuntimeDetour.HookGen.HookEndpoint.Modify (System.Delegate hookDelegate) [0x00013] in <454c317a535d48e898e657206da1cf99>:0
  at MonoMod.RuntimeDetour.HookGen.HookEndpointManager.Modify (System.Reflection.MethodBase method, System.Delegate callback) [0x00028] in <454c317a535d48e898e657206da1cf99>:0
  at MonoMod.RuntimeDetour.HookGen.HookEndpointManager.Modify[T] (System.Reflection.MethodBase method, System.Delegate callback) [0x00000] in <454c317a535d48e898e657206da1cf99>:0
  at IL.RoR2.BossGroup.add_DropRewards (MonoMod.Cil.ILContext+Manipulator ) [0x0000a] in <898b3b3632e94b37922b168e94ae1971>:0
  at R2API.ItemDropAPI.SetHooks () [0x00000] in <867463b4f9ea441bba7a8dc2a6baea57>:0
  at (wrapper managed-to-native) System.Reflection.MonoMethod.InternalInvoke(System.Reflection.MonoMethod,object,object[],System.Exception&)
  at System.Reflection.MonoMethod.Invoke (System.Object obj, System.Reflection.BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) [0x00032] in <c6bd535f6ab848b4a13f34d01b756eef>:0
   --- End of inner exception stack trace ---
  at System.Reflection.MonoMethod.Invoke (System.Object obj, System.Reflection.BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) [0x0004b] in <c6bd535f6ab848b4a13f34d01b756eef>:0
  at System.Reflection.MethodBase.Invoke (System.Object obj, System.Object[] parameters) [0x00000] in <c6bd535f6ab848b4a13f34d01b756eef>:0
  at R2API.Utils.APISubmoduleHandler+<>c.<InvokeStage>b__6_1 (System.Reflection.MethodInfo m) [0x00000] in <867463b4f9ea441bba7a8dc2a6baea57>:0
  at System.Collections.Generic.List`1[T].ForEach (System.Action`1[T] action) [0x00024] in <c6bd535f6ab848b4a13f34d01b756eef>:0
  at R2API.Utils.APISubmoduleHandler.InvokeStage (System.Type type, R2API.Utils.InitStage stage) [0x00068] in <867463b4f9ea441bba7a8dc2a6baea57>:0
  at R2API.Utils.APISubmoduleHandler+<>c__DisplayClass4_0.<LoadRequested>b__2 (System.Type t) [0x00000] in <867463b4f9ea441bba7a8dc2a6baea57>:0
  at R2API.Utils.EnumerableExtensions+<>c__DisplayClass0_0`1[T].<ForEachTry>b__0 (T element) [0x00000] in <867463b4f9ea441bba7a8dc2a6baea57>:0