SWFUpload with rails

Hey. I try to use SWFUpload Javascript/Flash library for uploading files in my Rails (RoR) app. Upload works with standard form but with SWFUpl开发者_如何学运维oad I get "HTTP Status: 422" error code. Can someone tell me how to fix that?

Setting up swfupload with rails is not 100% straigtforward. Try looking at this article: SWFUpload, Paperclip and Ruby on Rails