[Solved] Error - CKEditorControl.cs not found

I have been using the CKEditor control for a few weeks with no problems.  Now I suddenly get this error:

CKEditorControl.cs not found.

I am using the .Net version and I'm using Visual Studio 2013 Express.  I get the error in debug mode when I click on a row in a gridview control and then load the CKEditor control with text from my SQL database.  Here is the HTML:

<tr>
                <td>
                    <CKE:CKEditorControl ID="CKEditor1" BasePath="/ckeditor/" runat="server" BackColor="LightGoldenrodYellow"></CKE:CKEditorControl>
                </td>
            </tr>  

This worked until today.  Not sure what's wrong at this point.  Can anyone help?