List.Reverse() Does not work

Hi All,
I am trying to create a list and reverse the order of the list. but somehow the command returns error saying “1. Error (CS0029): Cannot implicitly convert type ‘void’ to ‘object’ (line 84)”.

Here is the Screenshot of the window:

Also here is the snippet of the Code:

    using System;
using System.Collections;
using System.Collections.Generic;

using Rhino;
using Rhino.Geometry;

using Grasshopper;
using Grasshopper.Kernel;
using Grasshopper.Kernel.Data;
using Grasshopper.Kernel.Types;



/// <summary>
/// This class will be instantiated on demand by the Script component.
/// </summary>
public class Script_Instance : GH_ScriptInstance
{
#region Utility functions
  /// <summary>Print a String to the [Out] Parameter of the Script component.</summary>
  /// <param name="text">String to print.</param>
  private void Print(string text) { /* Implementation hidden. */ }
  /// <summary>Print a formatted String to the [Out] Parameter of the Script component.</summary>
  /// <param name="format">String format.</param>
  /// <param name="args">Formatting parameters.</param>
  private void Print(string format, params object[] args) { /* Implementation hidden. */ }
  /// <summary>Print useful information about an object instance to the [Out] Parameter of the Script component. </summary>
  /// <param name="obj">Object instance to parse.</param>
  private void Reflect(object obj) { /* Implementation hidden. */ }
  /// <summary>Print the signatures of all the overloads of a specific method to the [Out] Parameter of the Script component. </summary>
  /// <param name="obj">Object instance to parse.</param>
  private void Reflect(object obj, string method_name) { /* Implementation hidden. */ }
#endregion

#region Members
  /// <summary>Gets the current Rhino document.</summary>
  private readonly RhinoDoc RhinoDocument;
  /// <summary>Gets the Grasshopper document that owns this script.</summary>
  private readonly GH_Document GrasshopperDocument;
  /// <summary>Gets the Grasshopper script component that owns this script.</summary>
  private readonly IGH_Component Component;
  /// <summary>
  /// Gets the current iteration count. The first call to RunScript() is associated with Iteration==0.
  /// Any subsequent call within the same solution will increment the Iteration count.
  /// </summary>
  private readonly int Iteration;
#endregion

  /// <summary>
  /// This procedure contains the user code. Input parameters are provided as regular arguments,
  /// Output parameters as ref arguments. You don't have to assign output parameters,
  /// they will have a default value.
  /// </summary>
  private void RunScript(double moduleDepth, int floorCount, List<int> setbackFloors, List<double> setbackValues, ref object A)
  {

    List<double> setbackLists = new List<double>();
    List<double> rsetbackLists = new List<double>();

    //Create Loop to Extract the FloorCounts
    /*
    for (int i = 0; i < setbackFloors.Count; i++)
    {
    for (int j = 0; j < setbackFloors[i]; j++)
    {
    double value = setbackValues[i];

    setbackLists.Add(value);

    }
    }
    */

    for (int i = 0; i < setbackValues.Count; i++)
    {
      double newSetback = moduleDepth - setbackValues[i];
      Print(newSetback.ToString());
      setbackLists.Add(newSetback);
    }

    //rsetbackLists = setbackLists.Reverse();

    A = setbackLists.Reverse(0, setbackLists.Count - 1);

  }

Any idea why that is happening?

Reverse the list before outputting it and without setting it to equal something. Write it just as you have without A=. Then A=setbackLists.

setbackLists.Reverse(0, setbackLists.Count - 1);
A=setbackLists;

Ah! That was so simple!
Thanks Michael!