Special:Badtitle/NS90:Forum:Tech Wishlist And Bug Reports/Special:Upload gives UploadStashFileException

I tried to upload a PNG screenshot of Thwaite from [//pineight.com/nes/thwaite003.png here] for its work page, and I got this error: [a3cd8528] 2014-07-17 00:36:36: Fatal exception of type UploadStashFileException I'm using Firefox 30.0 on Ubuntu 12.04 LTS. Is there anything I can do on my end, or is it a misconfiguration related to the recent outage?