我收到此错误：
include(Memcache.php) [<a href='function.include'>function.include</a>]: failed to open stream: No such file or directory
这是问题的完整描述：
384 * @return boolean whether the class has been loaded successfully
385 */
386 public static function autoload($className)
387 {
388 // use include so that the error PHP file may appear
389 if(isset(self::$_coreClasses[$className]))
390 include(YII_PATH.self::$_coreClasses[$className]);
391 else if(isset(self::$classMap[$className]))
392 include(self::$classMap[$className]);
393 else
394 {
395 if(strpos($className,'\\')===false)
396 include($className.'.php');
397 else // class name with namespace in PHP 5.3
398 {
399 $namespace=str_replace('\\','.',ltrim($className,'\\'));
400 if(($path=self::getPathOfAlias($namespace))!==false)
401 include($path.'.php');
402 else
403 return false;
404 }
405 return class_exists($className,false) || interface_exists($className,false);
406 }
407 return true;
408 }