Error message

• Notice: tempnam(): file created in the system's temporary directory in drupal_tempnam() (line 2309 of /home/rd/html/entredu.ea.gr/contest2014/includes/file.inc).
• Warning: file_put_contents(temporary://filecOrfS2): failed to open stream: "DrupalTemporaryStreamWrapper::stream_open" call failed in file_unmanaged_save_data() (line 1847 of /home/rd/html/entredu.ea.gr/contest2014/includes/file.inc).
• The file could not be created.
• Notice: tempnam(): file created in the system's temporary directory in drupal_tempnam() (line 2309 of /home/rd/html/entredu.ea.gr/contest2014/includes/file.inc).
• Warning: file_put_contents(temporary://filewRbmA6): failed to open stream: "DrupalTemporaryStreamWrapper::stream_open" call failed in file_unmanaged_save_data() (line 1847 of /home/rd/html/entredu.ea.gr/contest2014/includes/file.inc).
• The file could not be created.
• Notice: tempnam(): file created in the system's temporary directory in drupal_tempnam() (line 2309 of /home/rd/html/entredu.ea.gr/contest2014/includes/file.inc).
• Warning: file_put_contents(temporary://fileoVyFja): failed to open stream: "DrupalTemporaryStreamWrapper::stream_open" call failed in file_unmanaged_save_data() (line 1847 of /home/rd/html/entredu.ea.gr/contest2014/includes/file.inc).
• The file could not be created.
• Notice: tempnam(): file created in the system's temporary directory in drupal_tempnam() (line 2309 of /home/rd/html/entredu.ea.gr/contest2014/includes/file.inc).
• Warning: file_put_contents(temporary://fileuliG3d): failed to open stream: "DrupalTemporaryStreamWrapper::stream_open" call failed in file_unmanaged_save_data() (line 1847 of /home/rd/html/entredu.ea.gr/contest2014/includes/file.inc).
• The file could not be created.
• Deprecated function: Methods with the same name as their class will not be constructors in a future version of PHP; nodequeue_queue has a deprecated constructor in include_once() (line 933 of /home/rd/html/entredu.ea.gr/contest2014/includes/bootstrap.inc).
• Deprecated function: The each() function is deprecated. This message will be suppressed on further calls in _menu_load_objects() (line 553 of /home/rd/html/entredu.ea.gr/contest2014/includes/menu.inc).