PROBLEM: PHP MAPSCRIPT/ARCSDE

[ruth schÿfffff6nbuchner]

    Dear people, 
    
    I have got a problem querying a layer with ArcSDE and a created pointobj();
  In my mapfile I definded the correct parameters for the  ArcSDE-Connection because I can display the layers without any problems.
    
    When I want to query a layer, it says:
    Fatal error:  [MapServer Error]: msSDELayerGetShape(): SE_stream_fetch_row(): Invalid pointer argument to function. (-65)   in /../../webgis.php on line 142
  
  Line 142 of my webgis.php says the following:
  $Shape = $Abfragelayer->getShape($ti,$si);
  
  bevor line 142 I defined the queryable layer and the results:
    //create point object and querybypoint
    $punkt=ms_newPointObj();
    $punkt ->setXY($x_real,$y_real);
    @$map ->queryByPoint($punkt, MS_SINGLE, -1);
    
    //test, if query was succesful
    if((@$map ->queryByPoint($punkt, MS_SINGLE, -1))==MS_SUCCESS){
    $Abfrage="Abfrage hat geklappt";
    
    //find queryable layer
    for($iLayer=0; $iLayer < $map->numlayers; $iLayer++)
        {
            $Abfragelayer =   $map->GetLayer($iLayer);
    
            $numResults = $Abfragelayer ->getNumResults();
    
            if ($numResults == 0)
                continue;
    
    //open table of queryable layer and read row
    $Abfragelayer->open();
    
    $Spalte=explode(" ",$Abfragelayer->getMetaData("RESULT_FIELDS"));
    
    //read   entry of row
    
    //define specific object of shape
    $resultat=$Abfragelayer->getResult(0);
    
     $si=$resultat->shapeindex;
     $ti=$resultat->tileindex;
     $ci=$resultat->classindex;
    
    $Shape = $Abfragelayer->getShape($ti,$si);
  
  Surely  I made something wrong with correct options and parameters regarding to  ArcSDE in my php-script, because I am newbie to MapScript
    
    Can anybody help? Regards, Ruth
		
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