index was out of range amazon.glacier.archivetransfermanager

I'm getting an error "index was out of range. must be a non-negative and less than the size of the collection"

When I comment out all of the lines besides console.wirteline(archivetoupload) the loop works correctly.

Any ideas?

    namespace glacier.amazon.com.docsamples
{
    class ArchiveUploadHighLevel
    {


        public static void Main(string[] args)
        {
            string vaultName = "testvault";
            string archiveToUpload = "";

            DirectoryInfo info = new DirectoryInfo(@"c:\test\");
            FileInfo[] files = info.GetFiles().OrderByDescending(d => d.CreationTime).ToArray();

            foreach (FileInfo file in files)
            {
                try
                {
                    archiveToUpload = info + file.ToString();
                    Console.WriteLine(archiveToUpload);

                    var manager = new ArchiveTransferManager(Amazon.RegionEndpoint.APSoutheast2);
                    // Upload an archive.
                    string archiveId = manager.Upload(vaultName, "Test Document", archiveToUpload).ArchiveId;
                    Console.WriteLine("Archive ID: (Copy and save this ID for the next step) : {0}", archiveId);
                    Console.ReadKey();
                }
                catch (AmazonGlacierException e) { Console.WriteLine(e.Message); }
                catch (AmazonServiceException e) { Console.WriteLine(e.Message); }
                catch (Exception e) { Console.WriteLine(e.Message); }
                Console.WriteLine("To continue, press Enter");
                Console.ReadKey();
            }

        }


    }

}