’caffe，Net类析构函数时，捕获到以下错误： 错误使用caffe Could not convert handle to pointer due to invalid init key

警告: 执行 'caffe.Net' 类析构函数时，捕获到以下错误:
Could not convert handle to pointer due to invalid init_key. The object might have been cleared. 
> In classification_demo (line 59)
  In test (line 2) 

    function delete (self)
      if ~isempty(self.hNet_self)
        caffe_('delete_net', self.hNet_self);
      end
    end

    function delete (self)
      if self.isvalid
        caffe_('delete_net', self.hNet_self);
      end
    end