java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at org.obiba.opal.search.es.EsIndexManager$EsValueTableIndex.readMapping(EsIndexManager.java:444)
at org.obiba.opal.search.es.EsIndexManager$EsValueTableIndex.access$1700(EsIndexManager.java:335)
at org.obiba.opal.search.es.EsIndexManager$EsValueTableIndex$1.(EsIndexManager.java:381)
at org.obiba.opal.search.es.EsIndexManager$EsValueTableIndex.getTimestamps(EsIndexManager.java:376)
at org.obiba.magma.support.Timestampeds$1.compare(Timestampeds.java:14)
at org.obiba.magma.support.Timestampeds$1.compare(Timestampeds.java:10)
at org.obiba.opal.search.es.EsIndexManager$EsValueTableIndex.isUpToDate(EsIndexManager.java:371)

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