I get error when I've set: "Simple Mode (disables advance blueprint management options)": false, and change anything in the config file. In my example: 

"explosives": {
"defaultBP": false,
"canResearch": true,
"scrapRequired": 8000,
"unlockMinutesAfterWipe": -1,
"autoUnlockMinutesAfterWipe": false
},

(18:36:47) | Failed to call hook 'OnServerInitialized' on plugin 'BlueprintManager v2.1.3' (ArgumentException: An item with the same key has already been added. Key: -1478212975)
  at System.Collections.Generic.Dictionary2[TKey,TValue].TryInsert (TKey key, TValue value, System.Collections.Generic.InsertionBehavior behavior) [0x000dd] in <f98723dd4586469db5213ec59da723ca>:0 
  at System.Collections.Generic.Dictionary2[TKey,TValue].Add (TKey key, TValue value) [0x00000] in <f98723dd4586469db5213ec59da723ca>:0 
  at Oxide.Plugins.BlueprintManager.OnServerInitialized () [0x003eb] in <cef546c1689d4783b5f9d6ac4e3c281d>:0 
  at Oxide.Plugins.BlueprintManager.DirectCallHook (System.String name, System.Object& ret, System.Object[] args) [0x0006a] in <cef546c1689d4783b5f9d6ac4e3c281d>:0 
  at Oxide.Plugins.CSharpPlugin.InvokeMethod (Oxide.Core.Plugins.HookMethod method, System.Object[] args) [0x00079] in <9c80d821d00a44c9a24497c73ad2d20d>:0 
  at Oxide.Core.Plugins.CSPlugin.OnCallHook (System.String name, System.Object[] args) [0x000de] in <d646191a355d43a6b3ab36b7ee14c740>:0 
  at Oxide.Core.Plugins.Plugin.CallHook (System.String hook, System.Object[] args) [0x00060] in <d646191a355d43a6b3ab36b7ee14c740>:0