Visual Studio Code – Getting the following 'Could not load type "System.IO.Directory" from assembly "System.Runtime, Version = 4.0.0.0"'

Currently, Whenever I launch revit to test my addin that is supposed to export the contents of ViewSchedules in a revit document to txt format. I suspect something is wrong with my project references, however I am linking RevitAPI and RevitUIAPI.

Below is the code for the addin:

using Autodesk.Revit.Attributes;
using Autodesk.Revit.DB;
using Autodesk.Revit.UI;
using System.IO;
using static System.Net.Mime.MediaTypeNames;

namespace RevitExportImportSchedule
{
    [TransactionAttribute(TransactionMode.Manual)]
    public class Class1 : IExternalCommand
    {
        public string Export(Document doc, string export_folder_name, string extension)
        {
            FilteredElementCollector col = new FilteredElementCollector(doc).OfClass(typeof(ViewSchedule));

            ViewScheduleExportOptions opt = new ViewScheduleExportOptions();
            var output = "Exported Files:n";
            try
            {
                foreach (ViewSchedule vs in col)
                {
                    Directory.CreateDirectory(export_folder_name);

                    vs.Export(export_folder_name, vs.Name + "_Schedule" + extension, opt);
                    output += export_folder_name + vs.Name + "_Schedule" + extension + "n";
                }
                return output;
            }
            catch(Exception e)
            {
                output += e;
                return output;
            }
        }
        public Result Execute(ExternalCommandData commandData, ref string message, ElementSet elements)
        {
            var export_folder = "C:\Users\BEN.DENNISON\Documents\revit_open_auto";
            var extension = ".txt";
            UIApplication uiapp = commandData.Application;
            UIDocument uidoc = uiapp.ActiveUIDocument;
            Document doc = uidoc.Document;
            var output = Export(doc, export_folder, extension);
            
            TaskDialog.Show("Export", output);
            return Result.Succeeded;
        }
    }
}`

Here is my .addin:

<RevitAddIns>   

<AddIn Type="Command">     

<Name>RevitImportExport</Name>    

<FullClassName>RevitExportImportSchedule.Class1</FullClassName>  

<Text>Import/Export</Text>     

<Description>Exports/Imports all Schedules present in a revit project</Description>     <VisibilityMode>AlwaysVisible</VisibilityMode>     

<Assembly>      C:UsersBEN.DENNISONsourcereposRevitScheduleImportExportRevitScheduleImportExportbinDebugnet7.0RevitScheduleImportExport.dll   

</Assembly>     

<AddInId>239BD853-36E4-461f-9171-C5ACEDA4E723</AddInId>     

<VendorId>COMPANY</VendorId>     

<VendorDescription>COMPANY</VendorDescription>   

</AddIn> 

</RevitAddIns> 

I am using visual studio 2022

I have tried commenting out the export function to no avail which indicated to me it is a problem with how I am building it.