Parameter Number is Invalid

I am using Crystal Reports 8.0, with SQL Server.
I am trying to create a Report on a Stored Procedure.
My Stored Procedure is having 3 parameters (2 datetime parameters and 1 integer parameter).
When i select the stored procedure in the initial stage, it asks for the parameters. I tried entering 2050-01-01 00:00:00.000, etc etc ...

But I am getting an error "Parameter Number 1 is invalid" which is the same datetime field.

When I run the stored procedure in the query analyser. Its runs fine:
exec spTravelRpt_Person_chargeno '01-01-1990 00:00:00.000','01-01-2050 00:00:00.000',-1.

Can anyone plzzzz plzzz help me.. bcoz i am stuck.. i cannot move forward..

Ur help will be appreicated.Give only 2050-01-01 to datetime field and when calling the SP from your front end, pass the parameter in the format you want|||Hi Madhi,

I tried giving that too ... just
2050-01-01 ...
but it didnt help me...
Its giving the same error:
Parameter number 1 is invalid.
What do i do ????|||change the parameters datatype to varchar(20) instead of datetime and check.sql