[request-id 953b09474eb624414a4a43c7eeabc88c] API route error - { ".tag" = path; path = { ".tag" = "not_file"; };

I am trying to download a file using SwiftyDropbox.   I can connect to Dropbox ok and I can access my Dropbox files, but I cannot download files.  My code:

        let client = Dropbox.authorizedClient

        let destination : (NSURL, NSHTTPURLResponse) -> NSURL = { temporaryURL, response in

            let fileManager = NSFileManager.defaultManager()

            let directoryURL = fileManager.URLsForDirectory(.DocumentDirectory, inDomains: .UserDomainMask)[0]

            let UUID = NSUUID().UUIDString

            let pathComponent = "\(UUID)-\(response.suggestedFilename!)"

            return directoryURL.URLByAppendingPathComponent(pathComponent)

        }

        let fromPath = "/Panther4/\(filenameX)"

        let toPath = destination

        

        client!.files.download(path: fromPath, destination: toPath).response { response, error in

            if let (metadata, data) = response {

                print("Dowloaded file name: \(metadata.name)")

                print("Downloaded file data: \(data)")

            } else {

                print(error!)

            }

        }

and the error I get is: 

[request-id 953b09474eb624414a4a43c7eeabc88c] API route error - {

    ".tag" = path;

    path =     {

        ".tag" = "not_file";

    };

}

Any help would be appreciated.