Change Data Capture on an existing database

Hi Readers,

I am using the Sql Server CTP5 Developer edition on which i am able to perform CDC only if i start with creating a new database and then load the tables.The complete data change could be captured.

But when i implement the same on a existing database the following query fails,

DECLARE @from_lsn binary(10), @to_lsn binary(10);

SET @from_lsn = sys.fn_cdc_get_min_lsn('dbo_table1');

SET @to_lsn = sys.fn_cdc_get_max_lsn();

SELECT * from [cdc].[fn_cdc_get_all_changes_dbo_Table1](@from_lsn, @to_lsn, 'all')

GO

The Error i get is ,

Insufficient arguments supplied to function cdc.fn_cdc_get_all_......

However the  change data tracking on the database and the table could be enabled.

Nothing could be retrieved fron cdc.ddlHistory table as no data was captured.

Thanks and regards,

Karthik