What does the order rejection error "STOP LOSS ORDERS NOT ALLOWED IN CALL AUCTION" mean?

STOP LOSS ORDERS NOT ALLOWED IN CALL AUCTION

Only Market [MKT] & Limit [LMT] orders are allowed in the Pre market session [9:00am to 9:07am] -i.e Stop Loss[SL] & Stop Loss [SL-M] aren’t allowed, due to which the above oerder was rejected & the error was displayed.

For more information on Pre Market session refer the NSE circular.