[RESOLVED] Inconsistent Accessibility: base class WorkItem is less accessible than class...

[nikel]

Hello, I'm following a tutorial at Inheritance (C# Programming Guide) | Microsoft Docs and I'm getting this error:

Inconsistent Accessibility: base class WorkItem is less accessible than class ChangeRequest

What's going on here? I've come accross with this before on that site. Here's a part of the code:

namespace Business
{
    // ChangeRequest derives from WorkItem and adds an item (originalItemID)
    // and two constructors
    public class ChangeRequest : WorkItem
    {
        protected int originalItemID { get; set; }
        ...