STOP LOSS ORDERS NOT ALLOWED IN CALL AUCTION.
Only Market [MKT] & Limit [LMT] orders are allowed in the Pre-market session [9:00 am to 9:07 am] - i.e. Stop Loss [SL] & Stop Loss [SL-M] are not allowed, due to which the error is displayed.
For more information on the pre-market session refer to the NSE
circular
.