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java.lang.NullPointerException: 	at com.baidu.disconf.core.common.restful.impl.RestfulMgrImpl.downloadFromServer(RestfulMgrImpl.java:133)	at com.baidu.disconf.client.fetcher.impl.FetcherMgrImpl.downloadFileFromServer(FetcherMgrImpl.java:100)	at com.baidu.disconf.client.core.processor.impl.DisconfFileCoreProcessorImpl.updateOneConfFile(DisconfFileCoreProcessorImpl.java:107)	at com.baidu.disconf.client.core.processor.impl.DisconfFileCoreProcessorImpl.updateOneConf(DisconfFileCoreProcessorImpl.java:200)	at com.baidu.disconf.client.core.processor.impl.DisconfFileCoreProcessorImpl.updateOneConfAndCallback(DisconfFileCoreProcessorImpl.java:162)	at com.baidu.disconf.client.watch.inner.DisconfSysUpdateCallback.reload(DisconfSysUpdateCallback.java:24)	at com.baidu.disconf.client.watch.inner.NodeWatcher.callback(NodeWatcher.java:145)	at com.baidu.disconf.client.watch.inner.NodeWatcher.process(NodeWatcher.java:90)	at org.apache.zookeeper.ClientCnxn$EventThread.processEvent(ClientCnxn.java:526)