[已回复] MobileIMSDK安卓客户端登陆验证的时候服务端报错

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服务端我是直接使用github上下载的代码，直接导入eclipse。安卓客户端使用的也是github上下载的demo，在客户端点击登陆的时候，服务器就报了以下的错误，请问是什么原因导致的？
[INFO] - [15:05:57.798][IMCORE]UDP服务器正在端口7901上监听中... | (ServerLauncher^startup:172)
[DEBUG] - [15:06:02.796]【IMCORE】【QoS发送方】=========== 消息发送质量保证线程运行中, 当前需要处理的列表长度为0... | (QoS4SendDaemonS2C^run:166)
[INFO] - [15:06:04.902][IMCORE]与{uid:null,cid:-1}/192.168.43.9:59722的会话建立(sessionCreated)了... | (ServerCoreHandler^sessionCreated:545)
[DEBUG] - [15:06:04.906]Firing a SESSION_OPENED event for session 1 | (IoFilterEvent^fire:68)
[DEBUG] - [15:06:04.906]Firing a MESSAGE_RECEIVED event for session 1 | (IoFilterEvent^fire:68)
[INFO] - [15:06:04.907][IMCORE]与{uid:null,cid:-1}/192.168.43.9:59722的会话(sessionOpened)打开了... | (ServerCoreHandler^sessionOpened:572)
[DEBUG] - [15:06:04.908]Event SESSION_OPENED has been fired for session 1 | (IoFilterEvent^fire:117)
[INFO] - [15:06:04.954][IMCORE]>> 客户端{uid:null,cid:-1}/192.168.43.9:59722发过来的登陆信息内容是：getLoginName=h|getLoginPsw=f | (ServerCoreHandler^messageReceived:276)
[DEBUG] - [15:06:04.955]Event MESSAGE_RECEIVED has been fired for session 1 | (IoFilterEvent^fire:117)
[DEBUG] - [15:06:04.955]Firing a EXCEPTION_CAUGHT event for session 1 | (IoFilterEvent^fire:68)
[ERROR] - [15:06:04.955][IMCORE]exceptionCaught捕获到错了，原因是：net.openmob.mobileimsdk.server.demo.ServerEventListenerImpl.onVerifyUserCallBack(Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;)I | (ServerCoreHandler^exceptionCaught:74)
java.lang.AbstractMethodError: net.openmob.mobileimsdk.server.demo.ServerEventListenerImpl.onVerifyUserCallBack(Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;)I
at net.openmob.mobileimsdk.server.ServerCoreHandler.messageReceived(SourceFile:332)
at org.apache.mina.core.filterchain.DefaultIoFilterChain$TailFilter.messageReceived(DefaultIoFilterChain.java:690)
at org.apache.mina.core.filterchain.DefaultIoFilterChain.callNextMessageReceived(DefaultIoFilterChain.java:417)
at org.apache.mina.core.filterchain.DefaultIoFilterChain.access$1200(DefaultIoFilterChain.java:47)
at org.apache.mina.core.filterchain.DefaultIoFilterChain$EntryImpl$1.messageReceived(DefaultIoFilterChain.java:765)
at org.apache.mina.core.filterchain.IoFilterEvent.fire(IoFilterEvent.java:74)
at org.apache.mina.core.session.IoEvent.run(IoEvent.java:63)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
at java.lang.Thread.run(Thread.java:722)