Uncaught exception 'mginvalidpropertytypeexception'...when click on added point to map.

[Maciej Skorczewski]

hi!

In my project i add some markers on layer. ex. add image on layer who 
type='test'

When i click on layer i get xml whit selection option...it work great 
but when i add new symbol (market) and i clik on it i get xml (who looks 
fine) but i get error:

----
Fatal error: Uncaught exception 'mginvalidpropertytypeexception' in 
Unknown on line 0
----

whit this code i get name of selected layer (i work whit all layer on 
map,it even take a name od new layer whit markets)

//$xml --> i take it form user selecton (when he clik on object)
$sel = new MgSelection($map, $xml);
     $layers2 = $sel->GetLayers();
     for($i = 0; $i < $layers2->GetCount(); $i++)
     {
      $layer2 = $layers2->GetItem($i);
      //name of selected layer.
      $selected_layer=$layer2->GetName();
     }

..when i have name of selected layer i get properties of selected 
point(like ID,NAME etc..)


----- code ------

  $selectedFeatures=array();

     $layers= $selection->GetLayers();
	if($layers)
     {
	for($i=0; $i<$layers->GetCount(); $i++)
         {
	// only check selected features in our layer
	$layer=$layers->GetItem($i);
	if($layer && (!isset($selected_layer) || 
$layer->GetName()==$selected_layer))
             {
			// create a filter containing the IDs of the selected features on 
this layer
			 $layerClassName=$layer->GetFeatureClassName();
			 $selectionString=$selection->GenerateFilter($layer, $layerClassName);
             // get the feature resource for the selected layer
			 $layerFeatureId=$layer->GetFeatureSourceId();
			 $layerFeatureResource=new MgResourceIdentifier($layerFeatureId);
             // apply the filter to the feature resource for the 
selected layer. this returns MgFeatureReader for all the selected features
			 $queryOptions->SetFilter($selectionString);
			 $featureReader = 
$featureService->SelectFeatures($layerFeatureResource, $layerClassName, 
$queryOptions);
             // process items
			 while($featureReader->ReadNext())
			 // po jakiej zmniennej z plku
              $selectedFeatures[]=$featureReader->GetDouble('ID');
             }
		}
	}
----- end code --------


where error is? what is wrong?


-- 
Maciej Skorczewski