WHEN Screen1 initialize, data loading does not work

I try to load firebase data but the initialize screen1 method does not work, I tried with a clock but if I execute it when loading the screen it does not work, what could be the problem?

Every clock has a time value in milliseconds. If you set it to a low value e. g. 426 perhaps it will reach the clock.timer event even before the firebase data loaded. When the clock.timer set it’s enabled to false.