Need help to develop simple Sharepoint 2013 app to upload excel files to a library - sharepoint

Question

I spun up a new windows 2012 Server R2, installed Sharepoint 2013, and Visual Studio 2019 with the Office/Sharepoint dev options on an old Dell server. I'm trying to write and debug an app I found on the web to upload excel files from a shared drive to a sharepoint document library. I'm at the point where everytime I try to run this app, I get an error stating:
The Web application at http://tcaserver01/my/MPR could not be found.
Verify that you have typed the URL correctly. If the URL should be
serving existing content, the system administrator may need to add a
new request URL mapping to the intended application.
I just need a bit of hand-holding to get things properly configured I think. However, when I put in the url in a web browser, it shows the empty library fine.
using System;
using System.IO;
using Microsoft.SharePoint;
namespace SPTest2
{
class Program
{
[STAThread]
static int Main(string[] args)
{
String site = "http://tcaserver01/my/MPR"; //URL of SharePoint site
String library = "Review_Workbooks"; //Library Name
String filePath = #"S:\MPR\MPR Template.xlsx"; //Entire path of file to upload
try
{
using (SPSite spSite = new SPSite(site))
{
using (SPWeb spWeb = spSite.OpenWeb())
{
//Check if file exists in specified path
if (!System.IO.File.Exists(filePath))
Console.WriteLine("Error - Specified file not found.");
//Get handle of library
SPFolder spLibrary = spWeb.Folders[library];
//Extract file name (file will be uploaded with this name)
String fileName = System.IO.Path.GetFileName(filePath);
//Read file for uploading
FileStream fileStream = File.OpenRead(filePath);
//Replace existing file
Boolean replaceExistingFile = true;
//Upload document to library
SPFile spfile = spLibrary.Files.Add(fileName, fileStream, replaceExistingFile);
spfile.CheckIn("file uploaded via code");
spLibrary.Update();
}
}
Console.WriteLine("File uploaded successfully !!");
Console.ReadLine();
}
catch (Exception exp)
{
Console.WriteLine("Error uploading file - " + exp.Message);
Console.ReadLine();
}
return 0;
}
}
}

Answer 1

Well, it seems when I logged in as the Sharepoint admin user account, I was able to move further in the app, successfully opening up the Sharepoint site. So, when I was logged in as myself, I must not have had the appropriate permissions to open the site. So, this question should be closed as I can now get past what was blocking me. Thanks for anyone who may have read this question already!