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java.lang.NullPointerException: 	at org.apache.gora.mongodb.store.MongoMapping.newDocumentField(MongoMapping.java:109)	at org.apache.gora.mongodb.store.MongoMapping.addClassField(MongoMapping.java:169)	at org.apache.gora.mongodb.store.MongoMappingBuilder.loadPersistentClass(MongoMappingBuilder.java:169)	at org.apache.gora.mongodb.store.MongoMappingBuilder.fromFile(MongoMappingBuilder.java:112)	at org.apache.gora.mongodb.store.MongoStore.initialize(MongoStore.java:118)	at org.apache.gora.store.DataStoreFactory.initializeDataStore(DataStoreFactory.java:102)	at org.apache.gora.store.DataStoreFactory.createDataStore(DataStoreFactory.java:161)	at org.apache.gora.store.DataStoreFactory.createDataStore(DataStoreFactory.java:135)	at org.apache.nutch.storage.StorageUtils.createWebStore(StorageUtils.java:78)	at org.apache.nutch.crawl.InjectorJob.run(InjectorJob.java:233)	at org.apache.nutch.crawl.InjectorJob.inject(InjectorJob.java:267)	at org.apache.nutch.crawl.InjectorJob.run(InjectorJob.java:290)	at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:70)	at org.apache.nutch.crawl.InjectorJob.main(InjectorJob.java:299)