VOLUME BASED ALERT

DEAR TEAM,
HOW DO I CREATE ADVANCED TRIGGER IN SENTINEL FOR the FOLLOWING REQUIREMENT?.

MY REQUIREMENT IS "IF VOLUME OF CURRENT DAY IS 2 TIMES HIGHER THAN PREVIOUS DAY VOLUME THEN GENERATE ALERT.

FOR EXAMPLE, I HAVE USED the FOLLOWING SYNTAX BUT IT IS NOT WORKING PROPERLY.

VolumeTraded(‘NFO:SUNPHARMA19AUGFUT’) > (LastTradedQuantity(‘NFO:SUNPHARMA19AUGFUT’) * 2)

IT IS SHOWING ERROR LIKE CONDITION IS ALREADY MET BUT I DONT UNDERSTAND HOW DOES IT MEET CONDITION?.

TODAY’S DATE IS 01-08-2019 AND TIME IS AROUND 8 AM WHEN I CREATED THIS SCRIPT.

VOLUME TRADED FOR 31-07-2019 IS 12.3m.
VOLUME TRADED FOR 30-07-2019 IS 20 m.

SO CAN YOU PLEASE HELP ME TO RESOLVE THIS ISSUE?.