if isempty(editString)
errordlg('Please enter a name into the text-box. We thank you in anticipation.',...
'Error Code I');
return
elseif char(editString) > 12
    errordlg('Please enter a name that is less than 12 characters long. Thank you.',...
 'Error Code II');
    return
elseif isa(editString, 'integer')
    errordlg('Please enter a name, not numbers. Thank you.', 'Error Code III');
    return
elseif isa(editString, 'integer') && isa(editString, 'char')
    errordlg('Please enter a name without mixing numbers & characters. Thanks.',...
    'Error Code IV');
else
delete(gcf)
gui_02
end