The scripts file name does not match the name of the class defined in the script!

So, the file name of my C# MonoBehaviour script matches the class name exactly (including capitalization), but I'm getting the "The scripts file name does not match the name of the class defined in the script!" error when I drag it onto a game object in the editor. Has anyone seen this or have any thoughts?

Fixed by removing the namespace definition in the MonoBehavior.