Image uploading error (not 'http' error, different error)

I am running into an odd image uploading error. I have setup several wordpress installs on this host, and never run into it before.

It’s not showing as the ‘http’ error that I see a lot of posts about on here, or as a permissions error. I am just getting this error every time I try to upload an image:

“slider_1.jpg” has failed to upload due to an error
The uploaded file could not be moved to /var/www/vhosts/sideeffectsdesign.com/httpdocs/wordpress/wp-content/uploads.

The file cruches ok, but then this error comes up.

Any suggestions?