Get the high of 4hr candle from 15m chart

My indicator is running on the 15 minute chart and I need to get the high of a previous 4hr candle. I have similar code working at the start that works fine. However this one section is giving me a compile error, not code is highlighted red. The 4hr candle I am looking for is high[2]. It is this that is causing the error request.security(syminfo.tickerid, "240", high[2]) If I replace with just high[2] then there is no error

My code is:

if filteredtopf
    current_fractal_high := request.security(syminfo.tickerid, "240", high[2])
    current_fractal_high_index := bar_index-2
    if range_high == high[2]
        range_high_fractal := true

The issue was because it was inside an if statement. I removed from there and placed inside a function which I then call from the if