as3 error that i do not understand

hi
i am learning as3. i try to load  variables from a php file. i wrote this code according to some tutorial. what i test the movie i get the error message:

1037:packages cannot be nested.

i look at the code and i cannot see where is a nested package:

package {
      import flash.events.*;
      import flash.net.*;
      import flash.utils.trace;
      
      public class loadingas3 {
            public function loadingas3 () {
                  //create the URLLoader instance to be able to load data
                  var loader:URLLoader = new URLLoader();
                  
                  //define the event handler to perform once the loading is complete
                  loader.addEventListener(Event.COMPLETE, handleComplete);
                  
                  //tell the loader to load url-encoded variables: that is critical for this job
                  loader.dataFormat = DataFormat.VARIABLES;
                  
                  //now, load the data
                  loader.load(new URLRequest("loadingas3.php"));
            }
            
            private function  handleComplete (event:Event):void {
                  //cast the event target as a URLLoader instance, because that is what made the event to happen.
                   var loader:URLLoader = URLLoader(event.target);
                  
                   //trace the variables that was loaded by referencing the variable name from the data property of the URLLoader instance
                   trace("sometext=" + loader.data.sometext);
            }


            
      }
      
}

can anyone help?

best regards

ron