Can't upload to a specific folder getting 503 error

I am trying to upload a simple text file to a specific folder in google documents but with no luck.Here is the code:

          FileStream fileStream = new FileStream(@"c:\test.txt", System.IO.FileMode.Open);
                 DocumentEntry lastUploadEntry = globalData.service.UploadDocument("c:\\test.txt", null);                                                                               
 
 
                 string feed = "https://docs.google.com/feeds/upload/create-session/default/private/full/folder%folder:0B2dzFB6YvN-kYTRlNmNhYjEtMTVmNC00ZThkLThiMjQtMzFhZmMzOGE2ZWU1/contents/";
                 var result = globalData.service.Insert(new Uri(feed), fileStream, "application/pdf", "test");
 

and i get an error saying {"The remote server returned an error: (503) Server Unavailable."}

I am suspecting that the destination folders uri is wrong but i can't figure out the correct one.

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