Your error message is the following:
Warning: Unknown(): Your script possibly relies on a session
side-effect which existed until PHP 4.2.3. Please be advised that the
session extension does not consider global variables as a source of
data, unless register_globals is enabled. You can disable this
functionality and this warning by setting session.bug_compat_42 or
session.bug_compat_warn to off, respectively. in Unknown on line 0
Try creating an .htaccess file in your /moodle subdirectory with the following lines in it:
php_value session.bug_compat_warn 0
php_value session.bug_compat_42 0
Or you can ask your provider to change their settings in the php.ini configuration file on the server.