Empty Output when running Shortest Path Algorithm !!

Hi, I'm a new Giraph user. I installed Hadoop 1.2.1 with Giraph 1.0.0. I'd testing a tiny graph obtained from this blog: http://www.sbarjatiya.com/notes_wiki/index.php/Install_giraph_in_hadoop_node which use the Shortest Path algorithm but when checking the output, the file is empty. The

Re: Empty Output when running Shortest Path Algorithm !!

I this should should give you some clue: 14/09/21 13:34:03 WARN job.GiraphConfigurationValidator: Output format vertex index type is not known 14/09/21 13:34:03 WARN job.GiraphConfigurationValidator: Output format vertex value type is not known 14/09/21 13:34:03 WARN