用jfinal的demo和jfinal源码包运行报错?报错

@JFinal 你好，想跟你请教个问题：好象是包冲突，怎么解决呢

用jfinal的demo和jfinal源码包，运行后报错

Starting JFinal 1.5
Starting scanner at interval of 5 seconds.
Starting web server on port: 8006
Exception in thread "main" java.lang.NoSuchMethodError: org.slf4j.spi.LocationAwareLogger.log(Lorg/slf4j/Marker;Ljava/lang/String;ILjava/lang/String;[Ljava/lang/Object;Ljava/lang/Throwable;)V
	at org.eclipse.jetty.util.log.JettyAwareLogger.log(JettyAwareLogger.java:607)
	at org.eclipse.jetty.util.log.JettyAwareLogger.warn(JettyAwareLogger.java:431)
	at org.eclipse.jetty.util.log.Slf4jLog.warn(Slf4jLog.java:69)
	at org.eclipse.jetty.util.component.AbstractLifeCycle.setFailed(AbstractLifeCycle.java:204)
	at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:74)
	at com.jfinal.server.JettyServer.doStart(JettyServer.java:120)
	at com.jfinal.server.JettyServer.start(JettyServer.java:64)
	at com.jfinal.core.JFinal.start(JFinal.java:165)
	at com.demo.common.DemoConfig.main(DemoConfig.java:82)