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java.lang.NullPointerException: 	at com.google.appengine.api.NamespaceManager.get(NamespaceManager.java:101)	at com.google.appengine.api.memcache.BaseMemcacheServiceImpl.getEffectiveNamespace(BaseMemcacheServiceImpl.java:65)	at com.google.appengine.api.memcache.AsyncMemcacheServiceImpl.doGet(AsyncMemcacheServiceImpl.java:401)	at com.google.appengine.api.memcache.AsyncMemcacheServiceImpl.get(AsyncMemcacheServiceImpl.java:412)	at com.google.appengine.api.memcache.MemcacheServiceImpl.get(MemcacheServiceImpl.java:49)	at my.training.google.common.config.DatastoreConfigManager2.lookup(DatastoreConfigManager2.java:80)	at my.training.google.common.config.DatastoreConfigManager2.getString(DatastoreConfigManager2.java:117)	at my.training.google.mss.pipeline.InsertIntoBqWithCalendarWindow$1.apply(InsertIntoBqWithCalendarWindow.java:101)	at my.training.google.mss.pipeline.InsertIntoBqWithCalendarWindow$1.apply(InsertIntoBqWithCalendarWindow.java:95)	at com.google.cloud.dataflow.sdk.io.BigQueryIO$Write$Bound$TranslateTableSpecFunction.apply(BigQueryIO.java:1496)	at com.google.cloud.dataflow.sdk.io.BigQueryIO$Write$Bound$TranslateTableSpecFunction.apply(BigQueryIO.java:1486)	at com.google.cloud.dataflow.sdk.io.BigQueryIO$TagWithUniqueIdsAndTable.tableSpecFromWindow(BigQueryIO.java:2641)	at com.google.cloud.dataflow.sdk.io.BigQueryIO$TagWithUniqueIdsAndTable.processElement(BigQueryIO.java:2618)