Thanks, but it did not work. Scenario: Oracle 10g, datamodule, TFDQuery, TDataSetProvider, TClientDataSet, TDataSource, TUniDBGrid. Sql, Any sql statement does not work. The access violation error occurs when you try to open the TClientDataSet, as an object not created. The strange thing is that as VCL works normal and on my machine too. The problem is only on the server. Thanks, but it did not work. Scenario: Oracle 10g, datamodule, TFDQuery, TDataSetProvider, TClientDataSet, TDataSource, TUniDBGrid. Sql, Any sql statement does not work. The access violation error occurs when you try to open the TClientDataSet, as an object not created. The strange thing is that as VCL works normal and on my machine too. The problem is only on the server.