ADO Command Call Stored Return Type Name Is Invalid

Hi all,
I have a stored like this

CREATE PROCEDURE fts_insert_service_tasks( @status_no int output, @status_text nvarchar(255) output, @fts_employee char(100) , @fts_SCCode bigint, @fts_TaskDescription ntext) AS

declare @str_err nvarchar(255)
declare @err_no int

set @err_no=0

if ( isnumeric(@fts_SCCode) = 0 )
begin
set @str_err ='The fts Sccode is not a number'
set @status_text = @str_err
set @err_no=@err_no+1
return
end

if ( @fts_SCCode = '' )
begin
set @str_err ='The fts Sccode can not be null '
set @status_text = @str_err
set @err_no=@err_no+1
return
end


if ( len(@fts_employee) > 100)
begin
set @str_err ='Maximum Employee length allowed is 100 characters'
set @status_text = @str_err
set @err_no=@err_no+1
return
end


if ( @fts_employee = '' )
begin
set @str_err ='The employee fiedl can not be null'
set @status_text = @str_err
set @err_no=@err_no+1
return
end

if (@err_no=0)
begin

INSERT INTO fts_ServiceTasks (fts_employee , fts_Sccode, fts_taskdescription)
VALUES(@fts_employee, @fts_SCCode, @fts_taskdescription)

set @status_no=0
set @status_text = 'Add Service Task Ok'
end

else

begin
set @status_no=@err_no
set @status_text = @str_err
end
GO


and I called it from the ASP

<%function Add_Service_Task(fts_employee,fts_sccode, fts_TaskDescription)
cm.ActiveConnection = m_conn
cm.CommandType = 4
cm.CommandText = "fts_insert_service_tasks"
cm.Parameters.refresh
cm.Parameters(3).Value = fts_employee
cm.Parameters(4).Value = fts_sccode
cm.Parameters(5).Value = fts_TaskDescription
on error resume next
cm.Execute
if cm.Parameters(1)=0 then
exec_command=cm.Parameters(2).Value
else
call obj_utils.ErrMsg(cm.Parameters(2).Value,3000)
Response.End
end if
if err.number <> 0 then
call obj_utils.ErrMsg("System error at " & err.number & err.Description & ", please contact the administrator", 5000)
Response.End
end if
Add_Service_Task=exec_command
end function%>


I test with SQL 2k, Win2k3 OK
But with Win2k i got:

Error Type:
Microsoft OLE DB Provider for SQL Server (0x80040E30)
Type name is invalid.
/fmits/classes/cls_servicecall.asp, line 256


Please help me!