Correcting an issue when multiple autoloaders are registered. If you …

…throw an exception or trigger an error it will stop propagating through the autoloader stack. You should return true when the class is loaded, and false when it is not found so the other autoloaders can try, PHP will trigger the error for you.

Shield/Shield.php

@@ -143,8 +143,9 @@ private function _load($className)
         $path = __DIR__.'/'.str_replace('Shield\\', '/', $className).'.php';
         if (is_file($path)) {
             include_once $path;
+            return true;
         } else {
-            $this->throwError('Could not load class: '.$className);
+           return false;
         }
     }