Data Saving - Serializer Issue

So im having an issue saving data to a local file. I've narrowed down the error to a certain part of my data but im not sure what is causing it.
[JSON] { "clans": [ { "ClanID": "12345", "CreatedAt": "02/24/2018 - Pastebin.com
The pastebin above is my current data, the error occurs at GlobalPrints, other than that im not too sure whats going on. Full error is below:

Code:

Failed to initialize plugin 'Unleashed v0.1.1' (ArgumentNullException: Argument cannot be null.
Parameter name: s)
at ulong.Parse (string,System.Globalization.NumberStyles,System.IFormatProvider) <0x0007a>
at ulong.Parse (string) <0x00024>
at Oxide.Plugins.Unleashed/Clan..ctor (string,string,string) <0x00366>
at (wrapper dynamic-method) Oxide.Plugins.Unleashed/Clan.Void .ctor(String, String, String) (object[]) <0x000c8>
at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.CreateObjectUsingCreatorWithParameters (Newtonsoft.Json.JsonReader,Newtonsoft.Json.Serialization.JsonObjectContract,Newtonsoft.Json.Serialization.JsonProperty,Newtonsoft.Json.Serialization.ObjectConstructor`1<object>,string) <0x00c6f>
at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.CreateNewObject (Newtonsoft.Json.JsonReader,Newtonsoft.Json.Serialization.JsonObjectContract,Newtonsoft.Json.Serialization.JsonProperty,Newtonsoft.Json.Serialization.JsonProperty,string,bool&) <0x00199>
at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.CreateObject (Newtonsoft.Json.JsonReader,System.Type,Newtonsoft.Json.Serialization.JsonContract,Newtonsoft.Json.Serialization.JsonProperty,Newtonsoft.Json.Serialization.JsonContainerContract,Newtonsoft.Json.Serialization.JsonProperty,object) <0x00477>
at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.CreateValueInternal (Newtonsoft.Json.JsonReader,System.Type,Newtonsoft.Json.Serialization.JsonContract,Newtonsoft.Json.Serialization.JsonProperty,Newtonsoft.Json.Serialization.JsonContainerContract,Newtonsoft.Json.Serialization.JsonProperty,object) <0x000cf>
at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.PopulateList (System.Collections.IList,Newtonsoft.Json.JsonReader,Newtonsoft.Json.Serialization.JsonArrayContract,Newtonsoft.Json.Serialization.JsonProperty,string) <0x00525>

 

Thanks for the response! I'll have to take a look into that.