while(@someNameArray){
   print( __FILE__.__LINE__." $_ \n");# $_ correct
if(!($finder->isExist($_))) {
   print( __FILE__.__LINE__." trace \n");
    #not suffice if condition and didn't go here.
    ...... 
}else{
   print( __FILE__.__LINE__." $_ \n");# $_ wrong

}
}