Problems using class library on production machine

I have a class library with various namespaces created using VB.NET.

Example Class:

Namespace XYZ
    Public NotInheritable Class Class1
        Shared Function One() As List(Of String)
        End Function

        Shared Sub Two()
        End Sub
    End Class
End Namespace

There are several of these inside of a ClassLibrary.dll that is referenced in the ASP.NET Web Forms Web Site.

When I use this on the development machine, it works fine. However, when I try to call a page on the production machine that uses any code referenced it doesn't work.

My apologies, I don't have exact error messages, but they are basically:

Class1 has not been declared.
Namespace XYZ doesn't contain any Public members (or something along those line).

I have done some searching and haven't had any luck.

This code works when I test it using desktop applications and the aspx page running on the development machine's IIS.

I have tried moving the code to a module which didn't work. I have tried creating a new class file directly in the site and re-writing the code which didn't work.

When I place the code directly in the aspx.vb page, it doesn't generate the Compilation Error, but the DropDownLists still do not populate.

Example Code to Populate DropDownLists:

ddl_One.DataSource = Class1.GetEmployeeNames()
ddl_One.DataBind()

Edit (more information):

error BC30002: Type 'CapabilitiesForm' is not defined.

Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.0.30319.18408

Solution

The problem was with an IIS setting related to Application Pool.

I apologize I do not have a detailed solution, but it was through troubleshooting another issue that this one was resolved.