Zerodha expert advisor

when i put a strategy on a single chart which is opened on my screen only then it works, but when i write the same script in scanner it says “error” . how can i apply a set of 3 sentences of code on scanner and get real-time alert on 50 stocks at the same time on zerodha pi.
please help.

after a while i searched and found out that zerodha pi scanner only works with 1 set of function, why zerodha didnot enabled at least 3 set of function to get proper reliable signal rather than a single set of functions.