1. 看报错信息是说重复定义了 是不是定义常量的文件多次引入了 可以改用这种方式来定义:

    defined('CONSTANT') or define('CONSTANT', 'SomeDefaultValue');
  2. 这个url方法的源码,看下你的代码执行到哪个分支了:

    public function url($path)
        {
            $adapter = $this->driver->getAdapter();
    
            if ($adapter instanceof CachedAdapter) {
                $adapter = $adapter->getAdapter();
            }
    
            if (method_exists($adapter, 'getUrl')) {
                return $adapter->getUrl($path);
            } elseif (method_exists($this->driver, 'getUrl')) {
                return $this->driver->getUrl($path);
            } elseif ($adapter instanceof AwsS3Adapter) {
                return $this->getAwsUrl($adapter, $path);
            } elseif ($adapter instanceof RackspaceAdapter) {
                return $this->getRackspaceUrl($adapter, $path);
            } elseif ($adapter instanceof LocalAdapter) {
                return $this->getLocalUrl($path);
            } else {
                throw new RuntimeException('This driver does not support retrieving URLs.');
            }
        }