Could not init static class blocks

 
java.lang.RuntimeException:Unable to create application com.Application: java.lang.IllegalStateException: Could not init static class blocks
2 android.app.ActivityThread.handleBindApplication(ActivityThread.java:4331)
3 ......
4 Caused by:
5 java.lang.NoClassDefFoundError:org.jivesoftware.smackx.packet.DiscoverInfo$Identity
6 org.jivesoftware.smackx.ServiceDiscoveryManager.(Unknown Source)
7 java.lang.Class.classForName(Native Method)
8 java.lang.Class.forName(Class.java:251)
9 com.easemob.chat.InitSmackStaticCode.initStaticCode(Unknown Source)
10 com.easemob.chat.EMChat.init(Unknown Source)
11 com.easemob.easeui.controller.EaseUI.init(EaseUI.java:104)
12 com.easemob.helpdeskdemo.base.DemoHelper.init(DemoHelper.java:86)