How do I use UNetWeaver.dll during runtime?

Hi, I'm trying to create a runtime compilation system for my game so users can create mods that will be loaded during runtime. Right now the system works as follows:

1. Locate all the mod folders in mod directory.

2. Find all the .cs files within the mod directory and compile them into a single assembly.

3. Use UNetWeaver to process networked classes (NetworkBehaviours) within the built assembly. UNetWeaver is supposed to generate OnSerialize and OnDeserialize methods from SyncVars, Commands, ClientRpcs etc.

4. Activate the mod.

After compiling the mod assembly I process it with UNetWeaver.dll, running "WeaveAssemblies" method using reflections.

             //Processing the networked scripts.
             var unityDllPath = string.Empty;
             var unetDllPath = string.Empty;
             var weaverDllPath = string.Empty;
 
             unityDllPath = FileManager.GetApplicationDataPath() + "/Managed/" + "UnityEngine.dll";
             unetDllPath = FileManager.GetApplicationDataPath() + "/Managed/" + "UnityEngine.Networking.dll";
             weaverDllPath = Application.streamingAssetsPath + "/Compilation/UNETWeaver/Unity.UNetWeaver.dll";
 #if UNITY_EDITOR_WIN
             unityDllPath = "D:/Program Files/Unity/Editor/Data/Managed/UnityEngine.dll";
             unetDllPath = "D:/Users/Mateusz/Documents/x-team/xTeam/Built/xTeam_Data/Managed/UnityEngine.Networking.dll";
 #endif
             try
             {
                 //Load weaver assembly.
                 Assembly weaver = Assembly.LoadFile(weaverDllPath);
                 //Load dependencies.
                 foreach (var dependency in new DirectoryInfo(Application.streamingAssetsPath + "/Compilation").GetFiles())
                 {
                     if (Path.GetExtension(dependency.FullName) == ".dll")
                     {
                         Assembly.LoadFile(dependency.FullName);
                     }
                 }
 
                 if (weaver == null)
                 {
                     Debug.LogError("Couldn't find UNET weaver!");
                 }
                 if (weaver != null)
                 {
                     object obj = weaver.CreateInstance("Unity.UNetWeaver.Weaver");
                     if (obj != null)
                     {
                         System.Reflection.MethodInfo mi = obj.GetType().GetMethod("WeaveAssemblies");
                         mi.Invoke(obj, new object[]
                         {
                             new string[]
                             {
                                 outputPath
                             },
                             new string[0],
                             null,
                             path,
                             unityDllPath,
                             unetDllPath
                         });
                     }
                 }
             }
             catch (Exception ex)
             {
                 Debug.LogError(ex.Message);
             }

When invoking the WeaveAssemblies method I get a NullPointerException from the UNetWeaver.

I have no idea what is the exception caused by, as I included all the required parameters when invoking "WeaveAssemblies". What am I doing wrong? Is there an alternative to UNetWeaver with simmilar functionality?

UNetWeaver.dll I use LINK.