Chyba při tvorbě miniatur

<?php
class imageResize {
 
   var $image;
   var $image_type;
 
   function load($filename) {
 
      $image_info = getimagesize($filename);
      $this->image_type = $image_info[2];
      if( $this->image_type == IMAGETYPE_JPEG ) {
 
         $this->image = imagecreatefromjpeg($filename);
      } elseif( $this->image_type == IMAGETYPE_GIF ) {
 
         $this->image = imagecreatefromgif($filename);
      } elseif( $this->image_type == IMAGETYPE_PNG ) {
 
         $this->image = imagecreatefrompng($filename);
      }
   }
   function save($filename, $image_type=IMAGETYPE_JPEG, $compression=100, $permissions=null) {
 
      if( $image_type == IMAGETYPE_JPEG ) {
         imagejpeg($this->image,$filename,$compression);
      } elseif( $image_type == IMAGETYPE_GIF ) {
 
         imagegif($this->image,$filename);
      } elseif( $image_type == IMAGETYPE_PNG ) {
         imagepng($this->image,$filename);
      }
      if( $permissions != null) {
         chmod($filename,$permissions);
      }
   }
   function output($image_type=IMAGETYPE_JPEG) {
 
      if( $image_type == IMAGETYPE_JPEG ) {
         imagejpeg($this->image);
      } elseif( $image_type == IMAGETYPE_GIF ) {
 
         imagegif($this->image);
      } elseif( $image_type == IMAGETYPE_PNG ) {
         imagepng($this->image);
      }
   }
   function getWidth() {
 
      return imagesx($this->image);
   }
   function getHeight() {
 
      return imagesy($this->image);
   }
   function resizeToHeight($height) {
 
      $ratio = $height / $this->getHeight();
      $width = $this->getWidth() * $ratio;
      $this->resize($width,$height);
   }
 
   function resizeToWidth($width) {
      $ratio = $width / $this->getWidth();
      $height = $this->getheight() * $ratio;
      $this->resize($width,$height);
   }
 
   function scale($scale) {
      $width = $this->getWidth() * $scale/100;
      $height = $this->getheight() * $scale/100;
      $this->resize($width,$height);
   }
 
   function resize($width,$height) {
      $new_image = imagecreatetruecolor($width, $height);
      imagecopyresampled($new_image, $this->image, 0, 0, 0, 0, $width, $height, $this->getWidth(), $this->getHeight());
      $this->image = $new_image;
   }      
 
}

class galleryThumbs {

    private $directory;
    private $folderScan;
    private $thumbsWidth = 150;

    function __construct($dir) {
        if(!is_dir($dir)) {
            die("Error: folder does not exist!");
        }
        $this->directory = $dir;
        $this->folderScan = scandir($this->directory);
        unset($this->folderScan[0]);
        unset($this->folderScan[1]);
    }

    private function getImages($folder) {
        $images = scandir($folder);
        foreach($images as $key => $file) {
            if($file == "thumbs") {
                unset($images[$key]);
            }
        }
        unset($images[0]);
        unset($images[1]);
        return $images;
    }

    private function getThumbs($folder) {
        $images = scandir($folder);
        unset($images[0]);
        unset($images[1]);
        return $images;
    }

    private function generateThumbs($imageFolder, $filename) {
        if(file_exists($imageFolder.$filename)) {
            $resize = new imageResize;
            $resize->load($imageFolder.$filename);
            $resize->resizeToWidth($this->thumbsWidth);
            $resize->save($imageFolder."thumbs/".$filename);
        }
    }

    public function generate() {
        foreach($this->folderScan as $folder) {
            $images = self::getImages($this->directory."/".$folder);
            $thumbs = self::getImages($this->directory."/".$folder."/thumbs/");
            foreach($images as $image) {
                if(!in_array($image, $thumbs)) {
                    self::generateThumbs($this->directory."/".$folder."/",$image);
                }
            }
        }
    }
}


$thumbs = new galleryThumbs("actions");
$thumbs->generate();

?>