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

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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)

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