Signature upload problem

So basically I guess I’m the only one with this problem right now as I simply can not use/upload signature in any way. For whatever reason I’m not aware of and I’m guessing that this has something to do with the site being down for some last 7 days or so.

If I use the "insert image URL" option for hosting sites I get this error when I try to save and/or preview the signature.

Fatal error: Using $this when not in object context in /home/forums/public_html/includes/class_upload.php on line 402

And I can’t upload it with these two options either.

The option 1 gives me: Upload failed due to failure writing temporary file.

The option 2 gives me: Unable to save image