parsing upload session finish error

What output do you get? Some errors are themselves unions, so be sure to break those out if you need.

For example, here's a sample breaking out every possible error case (with the latest version of SwiftyDropbox, v3.0.0):

// we're ready to finish the upload and commit the file
client.files.uploadSessionFinish(cursor: Files.UploadSessionCursor(sessionId: result.sessionId, offset: fileLength),
 commit: Files.CommitInfo(path: "/test_swift_upload_session.txt"),
 // no additional data to add at this point in this case
 body:NSData()).response { response, error in
 if let result = response {
 print("Result: \(result)")
 } else if let callError = error {
 switch callError as CallError {
 case .RouteError(let boxed, let requestId):
 print("RouteError[\(requestId)]:")
 switch boxed.unboxed as Files.UploadSessionFinishError {
 case .Path(let fileLookupError):
 print("Path: ")
 switch fileLookupError {
 case .MalformedPath(let malformedPathError):
 print("MalformedPath: \(malformedPathError)")
 case .Conflict(let writeConflictError):
 print("Conflict:")
 switch writeConflictError {
 case .File:
 print("File")
 case .FileAncestor:
 print("FileAncestor")
 case .Folder:
 print("Folder")
 case .Other:
 print("Other")
 }
 case .DisallowedName:
 print("DisallowedName")
 case .InsufficientSpace:
 print("InsufficientSpace")
 case .NoWritePermission:
 print("NoWritePermission")
 case .Other:
 print("Other")
 }
 case .LookupFailed(let uploadSessionLookupError):
 print("LookupFailed:")
 switch uploadSessionLookupError {
 case .Closed:
 print("Closed")
 case .IncorrectOffset(let uploadSessionOffsetError):
 print("IncorrectOffset: \(uploadSessionOffsetError)")
 case .NotFound:
 print("NotFound")
 case .Other:
 print("Other")
 }
 case .Other:
 print("Other")
 }
 case .BadInputError(let message, let requestId):
 print("BadInputError[\(requestId)]: \(message)")
 case .HTTPError(let code, let message, let requestId):
 print("HTTPError[\(requestId)]: \(code): \(message)")
 case .InternalServerError(let code, let message, let requestId):
 print("InternalServerError[\(requestId)]: \(code): \(message)")
 case .OSError(let err):
 print("OSError: \(err)")
 case .RateLimitError:
 print("RateLimitError")
 }
 }
}

Apologies for the poor formatting on the forum!