Loading external library with serializable class raises exception

Hi! I've been trying to use a library I've made, in unity but whenever I load the dll in the project I get an error saying this

Error: Could not load signature of Neat_Algorithm.NeatNeuron:.ctor due to: Could not resolve type with token 0100001f (from typeref, class/assembly System.Runtime.Serialization.SerializationInfo, System.Runtime, Version=4.2.2.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a) assembly:System.Runtime, Version=4.2.2.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a type:System.Runtime.Serialization.SerializationInfo membernull) signature:<none>

If I remove all the code related to serialization & deserialization it works fine in unity.
Also the library works fine if I use it outside of unity (both serialization and deserialization)

Code (CSharp):

1. using Neat_Algorithm.Neat_Objects.Archives;
2. using System;
3. using System.Runtime.Serialization;
4.  
5. namespace Neat_Algorithm
6. {
7.     [Serializable]
8.     public class NeatNeuron : ISerializable
9.     {
10.         public int ID { get; }
11.         public string neuronType;
12.         public float value = 0;
13.         public double Layer;
14.         public ActivationFunctions.ActivationFunc ActivationFunction;
15.         public NeatNeuron(string neurontype, double layer)
16.         {
17.             neuronType = neurontype;
18.             ActivationFunction = ActivationFunctions.tanH;
19.             Layer = layer;
20.             ID = Neuron_Archive.AddNeuron(this);
21.         }
22.        
23.         public NeatNeuron(SerializationInfo info, StreamingContext context)
24.         {
25.             ID = info.GetInt32("ID");
26.             neuronType = info.GetString("neuronType");
27.             ActivationFunction = ActivationFunctions.funcs[info.GetInt32("ActivationFunction")];
28.             Layer = info.GetDouble("Layer");
29.             value = (float)info.GetValue("value", typeof(float));
30.         }
31.          public void GetObjectData(SerializationInfo info, StreamingContext context)
32.         {
33.             info.AddValue("ID", ID);
34.             info.AddValue("neuronType", neuronType);
35.             info.AddValue("ActivationFunction", ActivationFunctions.GetFuncIndex(ActivationFunction));
36.             info.AddValue("Layer", Layer);
37.             info.AddValue("value", value);
38.         }
39.     }
40. }
41.  

Also note that I'm not actually calling any method related to serialization in my code this exception is getting raised when loading the dll
I usually try to hammer this kind of stuff on my own but I feel completely clueless on this one been trying to figure it out for a long time now, any help would be incredible