Server error. Upload directory isn't writable message

Hey there.  Our form is giving users an error when they try to upload a photo or file to it.

It says Server Error. Upload directory isn't writable.

This is causing some pretty big issues for us.  I saw on a forum post somewhere that this was because of server space on your end (at least in that post it was) so if you can clear up space in that server for us that would be great.

Please let me know asap.  

The problem was temporary and has now been fixed. Upload is now back to normal.

Thank you and we apologize for the inconveniences caused.