actionscript 3 - Action Script 3: Addchild within an already added child issue -

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my issue error when function addspotlight called. 

typeerror: error #1010: term undefined , has no properties.     @ bubbleboy_fla::maintimeline/addspotlight()     @ bubbleboy_fla::maintimeline/policeheli()     @ flash.utils::timer/_timerdispatch()     @ flash.utils::timer/tick()

my code this:

//adding helicopter function addhelicopter(xlocation: int, ylocation: int, passspeedx, passspeedy): void {     var helicopter: helicopter = new helicopter(xlocation, ylocation, passspeedx, passspeedy);     back.addchild(helicopter);     helilist.push(helicopter);     playfly(); }  //adding spotlight function addspotlight(xspotlightlocation: int, yspotlightlocation: int, spotlightspeedx): void {     var spotlight: spotlight = new spotlight(xspotlightlocation, yspotlightlocation, spotlightspeedx);     back.helicopter.addchild(spotlight);     spotlightlist.push(spotlight); }

the reason doing because helicopter can destroyed , spotlight gets removed @ same time, if don't destroy helicopter , spotlight hits caught.

i had code add spotlight container lined helicopter, remove first spotlight in array.

if (helilist.length > 0) {     (var h: int = 0; h < helilist.length; h++)         (var l: int = 0; l < spotlightlist.length; l++) {             if (helilist[h].hittestpoint(boy.x + upbumppoint.x, boy.y + upbumppoint.y, true)) {                 trace("score points")                 score += 100;                 playcrash();                 playfly();                 helilist[h].removeheli();                 spotlightlist[l].removespotlight();                  //policetimer.start();             }         } }

any suggestions on these 2 issues??

in addspotlight use:

trace('spotlight: ', spotlight); trace('back: ', back); trace('back.helicopter: ', back.helicopter); trace('spotlightlist: ', spotlightlist);

whatever missing - causes issue :)


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