Java.lang.NullPointerException error after copy plugin and no known master node

Hi All,

I am trying to write plugin foe ES. Whenever, I copy the plugin inside
plugin folder of ES, I encounter with this error and ES dose not respond to
any comments(even after restarting ES and deleting plugin). So, I restart
the computer and it is fixed. Could you please let me know what is the
reason and if there is another way to solve it except restarting computer.

java.lang.NullPointerException error after copy plugin and no known master
no known master node, scheduling a retry
observer: timeout notification from cluster service. timeout setting [30s],
time since start [30s]....

[2015-02-17 10:45:34,660][ERROR][marvel.agent.exporter ] [Tommy] failed
to verify/upload the marvel template to [[0:0:0:0:0:0:0:0]:9209]:

Server returned HTTP response code: 503 for URL:

[2015-02-17 10:45:34,660][ERROR][marvel.agent.exporter ] [Tommy] could
not connect to any configured elasticsearch

Thank you

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