Having this mod enabled stops you from using debug menus. Here's the error that's being spat out :

Exception filling window for Verse.ImmediateWindow: System.TypeLoadException: Could not resolve type with token 01000024 (from typeref, class/assembly Multiplayer.API.SyncMethodAttribute, 0MultiplayerAPI, Version=0.3.0.0, Culture=neutral, PublicKeyToken=null)
at (wrapper managed-to-native) System.MonoCustomAttrs.GetCustomAttributesInternal(System.Reflection.ICustomAttributeProvider,System.Type,bool)
at System.MonoCustomAttrs.GetCustomAttributesBase (System.Reflection.ICustomAttributeProvider obj, System.Type attributeType, System.Boolean inheritedOnly) [0x00013] in <eae584ce26bc40229c1b1aa476bfa589>:0
at System.MonoCustomAttrs.GetCustomAttributes (System.Reflection.ICustomAttributeProvider obj, System.Type attributeType, System.Boolean inherit) [0x00037] in <eae584ce26bc40229c1b1aa476bfa589>:0
at System.Reflection.MonoMethod.GetCustomAttributes (System.Type attributeType, System.Boolean inherit) [0x00000] in <eae584ce26bc40229c1b1aa476bfa589>:0
at Verse.GenAttribute.TryGetAttribute[T] (System.Reflection.MemberInfo memberInfo, T& customAttribute) [0x00000] in <cd7169108ea74757aa50c5b33d275c15>:0
at Verse.DebugTabMenu_Actions.InitActions (Verse.DebugActionNode absRoot) [0x00080] in <cd7169108ea74757aa50c5b33d275c15>:0
at Verse.Dialog_Debug.TrySetupNodeGraph () [0x00040] in <cd7169108ea74757aa50c5b33d275c15>:0
at Verse.Dialog_Debug.SwitchTab (Verse.DebugTabMenuDef def) [0x00000] in <cd7169108ea74757aa50c5b33d275c15>:0
at Verse.Dialog_Debug..ctor (Verse.DebugTabMenuDef def) [0x0002d] in <cd7169108ea74757aa50c5b33d275c15>:0
at Verse.DebugWindowsOpener.ToggleDebugActionsMenu () [0x00013] in <cd7169108ea74757aa50c5b33d275c15>:0
at Verse.DebugWindowsOpener.DrawButtons () [0x00112] in <cd7169108ea74757aa50c5b33d275c15>:0
at Verse.ImmediateWindow.DoWindowContents (UnityEngine.Rect inRect) [0x00000] in <cd7169108ea74757aa50c5b33d275c15>:0
at Verse.Window.InnerWindowOnGUI (System.Int32 x) [0x001d3] in <cd7169108ea74757aa50c5b33d275c15>:0
UnityEngine.StackTraceUtility:ExtractStackTrace ()
Verse.Log:Error (string)
Verse.Window:InnerWindowOnGUI (int)
UnityEngine.GUI:CallWindowDelegate (UnityEngine.GUI/WindowFunction,int,int,UnityEngine.GUISkin,int,single,single,UnityEngine.GUIStyle)