Internal error in SearchEngine trying to make WikiSearcher: null

This is the whole log of the error.

3812760 [pool-2-thread-43] INFO org.wikimedia.lsearch.frontend.HttpHandler - query:/search/dev/Haferkleie?namespaces=1156&offset=0&limit=6&version=2.1&iwlimit=10 what:search dbname:dev term:Haferkleie java.lang.NullPointerException

at java.util.Hashtable.put(Hashtable.java:411)
at org.wikimedia.lsearch.search.WikiSearcher.<init>(WikiSearcher.java:97)
at org.wikimedia.lsearch.search.SearchEngine.search(SearchEngine.java:686)
at org.wikimedia.lsearch.search.SearchEngine.search(SearchEngine.java:115)
at org.wikimedia.lsearch.frontend.SearchDaemon.processRequest(SearchDaemon.java:92)
at org.wikimedia.lsearch.frontend.HttpHandler.handle(HttpHandler.java:193)
at org.wikimedia.lsearch.frontend.HttpHandler.run(HttpHandler.java:114)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
at java.lang.Thread.run(Thread.java:636)

3812762 [pool-2-thread-43] ERROR org.wikimedia.lsearch.search.SearchEngine - Internal error in SearchEngine trying to make WikiSearcher: null java.lang.NullPointerException

at java.util.Hashtable.put(Hashtable.java:411)
at org.wikimedia.lsearch.search.WikiSearcher.<init>(WikiSearcher.java:97)
at org.wikimedia.lsearch.search.SearchEngine.search(SearchEngine.java:686)
at org.wikimedia.lsearch.search.SearchEngine.search(SearchEngine.java:115)
at org.wikimedia.lsearch.frontend.SearchDaemon.processRequest(SearchDaemon.java:92)
at org.wikimedia.lsearch.frontend.HttpHandler.handle(HttpHandler.java:193)
at org.wikimedia.lsearch.frontend.HttpHandler.run(HttpHandler.java:114)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
at java.lang.Thread.run(Thread.java:636)

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Bnucist‎11:17, 11 October 2011