Failed Getting triangles & Failed setting Triangles - Using Quixel Voxel Terrain

I am trying to use the Quixel Voxel terrain engine found here: https://forum.unity3d.com/threads/open-source-quixel-terrain-engine-smooth-voxel-terrain.240645/

It was made for unity 4.6 but I am trying to update it to unity 5; however, some things have changed with how submeshes work and it is giving me the error:

Failed getting triangles. Submesh topology is lines or points.

Failed setting triangles. Some indices are referencing out of bounds vertices. IndexCount: 3, VertexCount: 0

When using

    if (mesh.GetTriangles(i).Length < 3)
                  {
                      mesh.SetTriangles(new int[3] { 0, 0, 0 }, i);
                  }

Without using this code snippet it gives me the error:

Failed getting triangles. Submesh 1 has no indices. Mesh asset path "Assets/Testing.unity" Mesh name ""

         public void setMesh(MeshData meshData)
         {
             densityData.setChangeData(densityChangeData);
 
             regenReq = false;
             if (regenFlag)
             {
                 regenFlag = false;
                 regenReq = true;
                 MeshFactory.requestMesh(this);
             }
 
             hasMesh = true;
             if (meshData.indexArray.Length == 0)
                 return;
 
             if (chunk == null)
             {
                 chunk = ChunkPool.getChunk();
                 if (LOD > 2)
                     chunk.transform.position = position - new Vector3(0f, (NodeManager.LODSize[LOD] / 2f), 0f);
                 else
                     chunk.transform.position = position;
 
                 chunk.GetComponent<MeshFilter>().mesh.subMeshCount = QuixelEngine.materials.Length;
                 chunk.GetComponent<MeshRenderer>().materials = QuixelEngine.materials;
             }
 
             empty = false;
             Mesh mesh = new Mesh();
             mesh.subMeshCount = QuixelEngine.materials.Length;
             mesh.vertices = meshData.triangleArray;
 
             for (int i = 0; i < QuixelEngine.materials.Length; i++)
             {
                 if (meshData.indexArray[i].Length > 0)
                 {
                     mesh.SetTriangles(meshData.indexArray[i], i);
                 }
 
                if (mesh.GetTriangles(i).Length < 3)
                 {
                     mesh.SetTriangles(new int[3] { 0, 0, 0 }, i);
                 }
 
             }
             //mesh.triangles = meshData.indexArray;
             mesh.uv = meshData.uvArray;
 
             mesh.normals = meshData.normalArray;
             mesh.RecalculateBounds();
             mesh.RecalculateNormals();
             mesh.Optimize();
 
             chunk.GetComponent<MeshFilter>().mesh = mesh;
 
             if (LOD == 0 && collides)
                 chunk.GetComponent<MeshCollider>().sharedMesh = null;
                 chunk.GetComponent<MeshCollider>().sharedMesh = mesh;
             meshData.dispose();
             mesh.Clear();
             
 
             renderCheck();
             switch (renderType)
             {
                 case RenderType.BACK:
                     if (chunk != null)
                         chunk.layer = 9;
                     break;
 
                 case RenderType.FRONT:
                     if (chunk != null)
                         chunk.layer = 8;
                     break;
             }
             if (parent != null)
                 parent.renderCheck();
         }

Any Help would be very much appriciated