Service tax late filing of nil return

Dear friends,

Our Company filed NIL Return online  on 23.11.2012 and I got the message "Your file has been uploaded successfully.  Please view the status after one business day."  I was under the impression my return is filed successfully. Today when I viewed the status I came to know that our return is rejected due to some error.  Today I filed the return again and got the message  in Status  as filed.   Now my question is  is there any penalty for two days late filing even it is NIL return.

Pleae help me

Regards,

Mani Nair