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java.lang.NullPointerException: null	at fr.pilato.elasticsearch.crawler.fs.rest.RestServer.start(RestServer.java:57)	at fr.pilato.elasticsearch.crawler.fs.FsCrawlerImpl.start(FsCrawlerImpl.java:178)	at fr.pilato.elasticsearch.crawler.fs.FsCrawler.main(FsCrawler.java:232)