Some weird output

Hey. just wondering if someone can explain to me why I get this output:

“Target not found: Target=“undefined” Base=”_level0"

It shows up after my preloader finishes and goes to the nextscene. Heres my actionscript setup on frame 2.

[AS]loadedbytes = getBytesLoaded();
totalbytes = getBytesTotal();
loadedkbytes = Math.ceil(loadedbytes/1000);
totalkbytes = Math.ceil(totalbytes/1000);
if (loadedbytes == totalbytes) {
nextScene();
}
percent = Math.ceil(loadedbytes/(totalbytes/100));
tellTarget(_root.loading) {
gotoAndStop(_root.percent);
}[/AS]

my preloader instance name is “loading” . And it works fine, I just dont understand why im getting that output?