No overload for method "X" takes `1' arguments

Hello Guys, I'm having a problem with the Draw Call Optimizer from AssetStore.

At the line 136,

 Mesh[] combinedMeshes = MeshCombineUtility.Combine(meshIntermediates.ToArray());

Indicates the following error

 No overload for method `Combine' takes `1' arguments

I tried to use, in the script where the error shows up :

Using MeshCombineUtility;

but still I was getting an error (cause' it's not a unity system type).

This is the Start sequence from the first script

 void Start()
     {
         
         MeshFilter[] filters = GetComponentsInChildren<MeshFilter>();
         Matrix4x4 myTransform = transform.worldToLocalMatrix;
         
         Dictionary<string, Dictionary<Material, List<MeshCombineUtility.MeshInstance>>> allMeshesAndMaterials = new Dictionary<string, Dictionary<Material, List<MeshCombineUtility.MeshInstance>>>();
         for(int i = 0; i < filters.Length; i++)
         {
             Renderer curRenderer = filters[i].renderer;
             MeshCombineUtility.MeshInstance instance = new MeshCombineUtility.MeshInstance();
             
             instance.mesh = filters[i].mesh;
             
             if(curRenderer != null && curRenderer.enabled && instance.mesh != null)
             {

In MeshCombineUtility.cs, the 2nd script, I have the following definitions :

 public class MeshCombineUtility 
 {    
     public struct MeshInstance
     {
         public Mesh      mesh;
         public int       subMeshIndex;            
         public Matrix4x4 transform;
     }
     
     public static Mesh Combine (MeshInstance[] combines, bool generateStrips)
     {
         int vertexCount = 0;
         int triangleCount = 0;
         int stripCount = 0;
         foreach( MeshInstance combine in combines )
         {........................................

Thank you for further help.

//EDIT

Seems that adding a boolean here

Mesh[] combinedMeshes = MeshCombineUtility.Combine(meshIntermediates.ToArray());

results into a matrix error : Cannot implicitly convert type UnityEngine.Mesh' to UnityEngine.Mesh[]'