Request coder to modify indicator alarm system

I found this indicator by chance, it seems to be full of accuracy, but when the arrow appears, there is no alarm. I hope the coder can help me to check and modify the alarm. Thank you，Sorry, English is not my native language

As the coder made a mistake, this indicator became a future indicator, that's why you can't get the alert.



It "knows" the sign will change at B when current bar is only at A, so it set a buy signal at A.

Appears to be a good indicator. Will give it a try. Regards