登录时报空指针: get dns config fail, android 4.4

(Landroid/content/Context;Ljava/lang/String;Ljava/lang/String;)V
04-18 11:22:29.808 31068-31178/cn.llzg.plotwikishop W/System.err: java.lang.NullPointerException
04-18 11:22:29.808 31068-31178/cn.llzg.plotwikishop W/System.err:     at com.easemob.chat.core.EMConnectionManager.connectSync(Unknown Source)
04-18 11:22:29.808 31068-31178/cn.llzg.plotwikishop W/System.err:     at com.easemob.chat.EMSessionManager.loginSync(Unknown Source)
04-18 11:22:29.808 31068-31178/cn.llzg.plotwikishop W/System.err:     at com.easemob.chat.EMSessionManager.access$0(Unknown Source)
04-18 11:22:29.808 31068-31178/cn.llzg.plotwikishop W/System.err:     at com.easemob.chat.EMSessionManager$1.run(Unknown Source)
04-18 11:22:29.828 31068-31180/cn.llzg.plotwikishop W/System.err: com.easemob.exceptions.EaseMobException: get dns config fail
04-18 11:22:29.828 31068-31180/cn.llzg.plotwikishop W/System.err:     at com.easemob.chat.core.EMConnectionManager.initConnectionConfig(Unknown Source)
04-18 11:22:29.828 31068-31180/cn.llzg.plotwikishop W/System.err:     at com.easemob.chat.core.EMConnectionManager.onInit(Unknown Source)
04-18 11:22:29.828 31068-31180/cn.llzg.plotwikishop W/System.err:     at com.easemob.chat.core.EMConnectionManager.onInit(Unknown Source)
04-18 11:22:29.828 31068-31180/cn.llzg.plotwikishop W/System.err:     at com.easemob.chat.EMSessionManager.initXmppConnection(Unknown Source)
04-18 11:22:29.838 31068-31180/cn.llzg.plotwikishop W/System.err:     at com.easemob.chat.EMSessionManager.loginSync(Unknown Source)
04-18 11:22:29.838 31068-31180/cn.llzg.plotwikishop W/System.err:     at com.easemob.chat.EMSessionManager.access$0(Unknown Source)
04-18 11:22:29.838 31068-31180/cn.llzg.plotwikishop W/System.err:     at com.easemob.chat.EMSessionManager$1.run(Unknown Source)
04-18 11:22:29.838 31068-31180/cn.llzg.plotwikishop E/emlogin: login errorfailed to connect to server ：com.easemob.exceptions.EaseMobException: get dns config fail