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Why am Igetting the error "Could not load type 'CADE.main.index'." on a new server when I'm using the same code on all other instances, how fix it?

I just checked out my "mixed" (asp classic and .Net) web site source from SVN on a new Windows 2019 Server. When I go to the logon page (.asp classic), it's fine but when you logon and call the main page (.aspx) it throws the error: "Could not load type 'CADE.main.index'" and displays:
Line 1: <%# Page Language="C#" AutoEventWireup="true" CodeBehind="index.aspx.cs" Inherits="CADE.main.index" %>
This SVN code is running on 15+ servers, including one 2019 Server. The code behind looks like:
namespace CADE.main
{
public partial class index : BasePage // Override with BasePage
{
IIS and everything under Application Development is installed. IIS serves .asp, .txt, .gif, .png, even .Net handlers (.ashx) and web services (.asmx), just not the aspx pages.
So, I rebuilt the solution with VS2019 and published it, gave administrator permissions on the app pool, gave "Everyone" full permissions on the entire web, deleted the bin directories in both the source and web locations, ensured output path was bin/, cleaned the project, don't think I should change CodeBehind to CodeFile, and tried about every other thing that people have suggested on this web site but nothing has eliminated the error.
Question: How do I fix this error so the .aspx pages loads?
EDIT #1: 15 hours after post
I'm not sure but with this information maybe this should be a new post.
This error ONLY happens on the second web site. IIS is serving two web sites, separating them by host name (web1.com vs. web2.com) in bindings. They both point at the same file structure. Web1's subdirectories are natural while Web2's subdirectories are virtual directories that point to Web1's.
Web1: Normal IIS web
wwwroot
LMW (subweb, LMW/Main/index.aspx is page in question, but works here)
Web2: Second web in IIS, based on host name, uses Web1's folders as virtual directories.
wwwroot
WEB2 (folder under wwwroot)
LMW (virtual directory points to Web1/wwwroot/LMW. LMW/Main/index.aspx gives the error here)
Question: Why doesn't the .aspx work when it's a virtual directory?... it's the same file as is in Web 1?
EDIT #2
It is working but I don't know what I did to fix it. I'm sure I changed something but I don't know what it was. So, I created another web like web #2, New web folder under wwwroot with LMW a virtual directory pointing to Web1/wwwroot/LMW! I'm seriously missing something, Any ideas?

These errors occur if the .aspx page or the Global.asax page contains a reference to a code-behind module and if the application has not been built.
You could try the below method to build the application:
Use the C# command-line compiler (CSC.exe) to run the following command:
csc /t:library /r:System.web.dll /out:mydll.dll myfile.cs
OR
In Microsoft Visual Studio .NET, click Build on the Build menu.
Also try changing CodeBehind="index.aspx.cs" to CodeFile="index.aspx.cs". This change is required when you change project type from website to webapplication or vice versa.
make sure you install the .ne framework feature of iis.

I actually created a brand new web that used a Virtual Directory for it's codebase that is the same code as the other webs.
Index.aspx resides in the /lmw/main directory. I had created an Application on that folder when I was creating the other applications in the web. So, I removed the "Application" from /lmw/main and it worked.

View ascx.cs files from deployed website?

I've got a website that I published on IIS, but it seems like I've got the wrong version of source code in my dev environment.
I just need the code from 1 ascx.cs file.
Can I get to the contents of an ascx.cs file from a deployed website?
I've tried using .NET Reflector as suggested on other posts, but it seems like this tool only gives me access to my normal classes and not to the .ascx.cs files. Or am I just missing that?
EDIT:
Additional information as requested in answers.
<%# Control Language="C#" AutoEventWireup="true" CodeFile="timesheet.ascx.cs" Inherits="controls_timesheet" %>

You should use the DLL of the compiled web site to get the class that represents your .ascx.cs file.
For example, if your project is called MyWebSiteProject, you should have a MyWebSiteProject.dll on your /bin folder.
Open this DLL with .net Reflector, or http://ilspy.net/, if your control is named MyUserControl, it should be inside the namespace MyWebSiteProject.
Please double check your project's and controls namespace first.
Hope this helps, good luck :)

ASP.NET Build - Bin Folder vs CodeBehind File

Assume there is a asp.net 4.0 web application and it has a default.aspx and default.aspx.cs files in it. After I build the project, a dll that is named of the project created in the bin folder. So what the dll contains ? All code behind files compiled versions ?
If the aspx files still refers its CodeBehind file like below, then does the dll used for this aspx file or still code behind is valid to run the project ?
<%# Page Title="Home Page" Language="C#" MasterPageFile="~/Site.master" AutoEventWireup="true"
CodeBehind="Default.aspx.cs" Inherits="WebApplication3._Default" %>

In a Web Application, all your C# code is contained within the DLLs in the bin directory. There are a couple of exceptions, such as DLLs that you rely on that live in the GAC, for example. Using a web application ( your question says this is what you are using ), you do not need to deploy your *.cs code behind files.
A Web Site is different. Changes are detected and recompiled on the fly. You'll need to include your C# files code-behind files when creating a Web Site type project.
ASP.NET Web Site or ASP.NET Web Application?

A DLL is a library that contains code and data that can be used by more than one program at the same time:
What is a DLL?
Code-behind refers to code for your ASP.NET page that is contained within a separate class file. This allows a clean separation of your HTML from your presentation logic:
ASP.NET Code-Behind Model Overview

The code gets compiled into the assembly produced by your web project. You can change its name and default namespace as part of project options.
As I understood it, the ASPX file is only used IF the project is marked as being updatable, otherwise it is just a placeholder file.

ASP.NET Master Page Parse Error

I have a Visual Studio 2010 project with a Master Page that works fine.
~/Site.Master
In the same project is a Folder with another directory structure that needs to use another Master Page.
/xr
Within this folder, I have included the Master Page for those files.
/xr/XR.Master
My Default.aspx file attempts to access this Master Page using the following include:
<%# Page Title="XR Project" Language="C#" MasterPageFile="~/xr/XR.Master" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="Test1.Default" %>
Debugging on my machine in localhost works fine, but whenever I deploy it and try to navigate to the Default page in the xr folder, I get
Parser Error Message: The file '/xr/xr/XR.Master' does not exist.
However, the Source Error returns Line 1 as I have shown above.
Here is what I tried:
I moved the XR.Master page into the root folder and changed all of the files in the xr folder to reference the XR Master Page using the following include:
I debugged and tested the code on my machine using localhost, and it worked fine.
I pushed it out to the remote website and got the new error:
Parser Error Message: The file '/xr/~/XR.Master' does not exist.
What am I doing wrong?
EDIT: I do not like posting a link to the page, but I will for a short time until this is resolved:
Projects
From there, you will see everything works well enough except for the link to XR1200.

Here's the best advice I can give ya without knowing too much about your project structure.
I'm hoping you are using VS2010 so that things will look the same for you as on my machine.
One easy way to get the path of your master page all figured out is to add a test web page from masterfile, the path will be preset for you and you can use that in your existing pages.
Here is my blogs project structure.
Right click the folder where you want to add the test page and click add new file.
Add a new web form using Master Page. This is just for testing.
Now locate your Masterpage and select it.
From here just find your newly added content page in your solution structure and check the code files for the path to your masterpage.
Once you've verified that your path is correct, if it still bombs once you publish it then you've got either an issue where not all of your projects are building properly, or you're files aren't being uploaded properly and that is going to end up being something that you may just have to find on your own. I still suggest blowing away anything in your pub folder on your server and trying a clean publish.
Hope this helps!

my guess is that the iis setup is different on the different machines. typically, you see something like this when you have one machine set up with the site itself as a website and another machine set up with the site itself as an application within a website (like the Default Website). it looks like you have addressed this possibility by using the ~ in the path, but perhaps the iis on which you are deploying does not have the site directory itself set up as either a website or an application, but is merely a subdirectory of a site. in that case, the ~ would refer to the website directory (perhaps named xr?) and the site is in a subdirectory of that named xr. if this is the case, the solution is probably to set up iis such that you have the application directory configured as an application on the server to which you are deploying.

How to map a virtual directory to a website in VS?

I am developing a C# VS 2008 website, trying to add a Master file. I created a virtual directory in IIS housing the "Master" folder, containing the Master files.
Now how do I reference these files from my website in VS? One problem is I do not know where I need to publish this Master folder to. Other problem is I do not know how to reference this Master file in my aspx Page directive.
FYI, this master folder is physically located outside of c:\inetpub\ in a totally separate file location. Is this a problem?

I don't think you'll get away with using a virtual folder for that because any pages that refer to the master page will be in the same application space as the master page (remember that master pages are just user controls). You create child pages by using Visual Studio or Expression Web to select "create from master page"