Datawindow Error: No CS_Command pointer passed to function: Describe

Hi,

In my application which uses Powerbuilder 12.5 and Sybase 15,

select eff_dt, url

into :ld_temp, :is_dms_server

from emp_details

where for_id = 5

and server_nm = :ls_servername

using ln_tr;

IF ln_tr.sqlcode <> 0 THEN

MessageBox("SQL error ", "Error retreiving from Table"+ln_tr.sqlerrtext )

END IF

The data is available in the table. But while running the application, in some occassions i am getting the error message

"Mismatch between retrieve columns and Fetch columns".

To remove this, we replaced the embedded SQL with Datastore method. But we are now getting a datawindow error in some occassions

"Select Error:No CS_Command pointer passed to function: Describe"

I don't understand why this is happenning. Please suggest upon this.

Thanks.!

Krishna