Unable to read ALL errors in error window

VS2013 - Package - C#

I want to read all errors/hints/warnings in the error window.

By following the example on MSDN concerning "ToolWindows.ErrorList Property" 

I added this code to my package:

                ErrorList errorList = dte.ToolWindows.ErrorList;
                ErrorItems errorItems = errorList.ErrorItems;

                string aString = string.Empty;
                int countErr = errorItems.Count;
                if (countErr != 0)
                {
                    for (int i = 1; i <= countErr; i++)
                    {
                        aString += (errorItems.Item(i).Description.ToString() + "\n");
                    }
                    MessageBox.Show(aString);
                }
                else
                {
                    MessageBox.Show("There are no items in the error list.");
                }

And it returned all standard build errors and warnings. However, I have StyleCop installed, and none of those warnings are returned.  Why is that?  I read a link somewhere about a package only being able to delete its own messages, but I'm not trying to delete, just read.  Is that still not allowed?  I then found another post that suggested that a package could use a ErrorListProvider to retrieve errors as well. Here is the code I added to my package:

        private void MenuItemCallback(object sender, EventArgs e)
        {
            DTE2 dte = (DTE2)GetService(typeof(DTE));

            if (errorListProvider == null)
            {
                IServiceProvider serviceProvider = new ServiceProvider(dte as Microsoft.VisualStudio.OLE.Interop.IServiceProvider);
                errorListProvider = new ErrorListProvider(serviceProvider);
                errorListProvider.ProviderName = "My Package";
                errorListProvider.ProviderGuid = new Guid(GuidList.guidMyPkgString);
            }

            int countErr = errorListProvider.Tasks.Count;
            if (countErr != 0)
            {
                string aString = string.Empty;
                foreach (ErrorTask task in errorListProvider.Tasks)
                {
                    aString += (task.Text + "\n"); 
                } 
                MessageBox.Show(aString);
            }
            else
            {
                MessageBox.Show("There are no items in the error list.");
            }
        }

This code complied and ran, but returned no errors at all.  What am I doing wrong?

- Thanks