The errormessag says that it can not find the file "/home/dir/public_html/templates/argos_theme/languages/EN.php" ... please verify if the file exists and if ownership & permission are set in a way so that the webserver has readaccess to it.
This is what should be in that file:
<?php
// $Id: EN.php 1080 2009-07-18 14:21:41Z Ruebenwurzel $
/*
Website Baker Project <http://www.websitebaker.org/>
Copyright (C) 2004-2009, Ryan Djurovich
Website Baker is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
Website Baker is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with Website Baker; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
//Modul Description
$template_description = 'Enhanced backend theme for Website Baker 2.8.';
//Texts
$TEXT['ADMIN_ONLY'] = 'Settings for administrator only';
$TEXT['NO_SHOW_THUMBS'] = 'Hide thumbnails';
$TEXT['TEXT_HEADER'] = 'Set maximum imagesize for a folder</b><br><small><i>(resizing on new uploads only)</i></small>';
?>
The whole description you are giving suggests, that the webserver has no read access to some of the subdirectories of the theme. You might want to switch to a different theme, uninstall and then install the Argos Theme again.
cheers
Klaus