Error message

• Notice: tempnam(): file created in the system's temporary directory in drupal_tempnam() (line 2504 of /is/htdocs/wp13236752_ER7VJ1Q2LJ/www/includes/file.inc).
• Warning: file_put_contents(temporary://file6hBNwg): failed to open stream: "DrupalTemporaryStreamWrapper::stream_open" call failed in file_unmanaged_save_data() (line 1962 of /is/htdocs/wp13236752_ER7VJ1Q2LJ/www/includes/file.inc).
• The file could not be created.
• Notice: tempnam(): file created in the system's temporary directory in drupal_tempnam() (line 2504 of /is/htdocs/wp13236752_ER7VJ1Q2LJ/www/includes/file.inc).
• Warning: file_put_contents(temporary://fileWgRsCG): failed to open stream: "DrupalTemporaryStreamWrapper::stream_open" call failed in file_unmanaged_save_data() (line 1962 of /is/htdocs/wp13236752_ER7VJ1Q2LJ/www/includes/file.inc).
• The file could not be created.