title: Uploadify: File upload error - unable to create a temporary file in Unknown on line 0
body: <p>I am experiencing the following error with uploadify and uploadifive:</p>
  
  <pre><code>PHP Warning:  File upload error - unable to create a temporary file in Unknown on line 0
  </code></pre>
  
  <p>This is an intermittent issue.  Sometimes uploads work OK, sometimes not.  Up until yesterday all was working well, and I am not aware of having made any changes to uploadify or uploadifive.  At the front end it appears that uploads have completed successfully, i.e. no errors are reported and the <code>onQueueComplete</code> event fires, but files are not showing in my upload folder, and the error above shows in my <code>error_log</code>.</p>
  
  <p>I'm wondering what I can do to troubleshoot this issue.</p>
  
  <hr>
  
  <p><strong>ADDITIONAL SESSION ERRORS:</strong></p>
  
  <pre><code>PHP Warning: session_start() [&lt;a href='function.session-start'&gt;function.session-start&lt;/a&gt;]: open(/tmp/sess_6d08c1a8c3703bb08a3dc585e1828109, O_RDWR) failed: No space left on device (28) in /home/..../uploadifive.php on line 6
  
  PHP Warning: Unknown: open(/tmp/sess_6d08c1a8c3703bb08a3dc585e1828109, O_RDWR) failed: No space left on device (28) in Unknown on line 0
  
  PHP Warning: Unknown: Failed to write session data (files). Please verify that the current setting of session.save_path is correct (/tmp) in Unknown on line 0
  </code></pre>