ClientDataset: Must apply updates before refreshing data

[juna]

I have a client-server application . I am using ClientDataSet / DataSetProvider.

I have a problem with the ClientDataSet.
When tryning to save the data after editing them, I use this methods to save them:

ClientDataSet.Post;
ClientDataSet.ApplyUpdates(-1);
ClientDataSet.Refresh;

I get this error message : ClientDataset: Must apply updates before refreshing data

I don't know how to solve this problem.

Thank you