Error message

• Notice: tempnam(): file created in the system's temporary directory in drupal_tempnam() (line 2549 of /home/kyaps/public_html/includes/file.inc).
• Warning: file_put_contents(temporary://files4xR0t): failed to open stream: "DrupalTemporaryStreamWrapper::stream_open" call failed in file_unmanaged_save_data() (line 1983 of /home/kyaps/public_html/includes/file.inc).
• The file could not be created.