Q:

Uploadify: File upload error - unable to create a temporary file in Unknown on line 0

I am experiencing the following error with uploadify and uploadifive:
PHP Warning:  File upload error - unable to create a temporary file in Unknown on line 0

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 onQueueComplete event fires, but files are not showing in my upload folder, and the error above shows in my error_log.
I'm wondering what I can do to troubleshoot this issue.

ADDITIONAL SESSION ERRORS:
PHP Warning: session_start() [<a href='function.session-start'>function.session-start</a>]: 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

A:

It seems that your /tmp has space issues.
You can check the disc space size by running df -h on the console.
If you cannot clear the /tmp space issue, you could consider moving the temporary upload file path: http://www.php.net/manual/en/ini.core.php#ini.upload-tmp-dir

