[ms4w-users] Php Mapscript Error: getLayerByName failed for

[Nicholas Efremov-Kendall]

Here's the error generated. I'm trying to customize one of Bill Kropola's
examples to my own data. Any suggestions

*Warning*: getLayerByName failed for : sites in *
C:\ms4w\Apache\htdocs\jerba_dbase\index.php* on line *121*

*Fatal error*: Call to a member function set() on a non-object in *
C:\ms4w\Apache\htdocs\jerba_dbase\index.php* on line *122

  if (preg_match("/satt/", $layers)){
      $satt = "CHECKED";
      $this_layer = $map->getLayerByName('satt');
      $this_layer->set('status', MS_ON);
   } else {
      $satt = "";
      $this_layer = $map->getLayerByName('satt');
      $this_layer->set('status', MS_OFF);
   }

   if (preg_match("/soils/", $layers)){
      $lakes = "CHECKED";
      $this_layer = $map->getLayerByName('soils');
      $this_layer->set('status', MS_ON);
   } else {
      $soils = "";
      $this_layer = $map->getLayerByName('soils');
      $this_layer->set('status', MS_OFF);
   }

   if (preg_match("/sites/", $layers)){
      $states = "CHECKED";
      $this_layer = $map->getLayerByName('sites');
      $this_layer->set('status', MS_ON);
   } else {
      $sites = "";
      $this_layer = $map->getLayerByName('sites');
      $this_layer->set('status', MS_OFF);
*
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