[Problem} Not found net.liftweb.util.Helpers class

[Chatree Srichart]

Hi all,

When I run "mvn package" in /trunk/server directory. I get web app directory
(/trunk/server/target/esme-server-0.3.0-SNAPSHOT/).
When I deploy this directory in Tomcat. I get error in the log like this:

java.lang.NoClassDefFoundError: Could not initialize class
net.liftweb.util.Helpers$
    at net.liftweb.util.LogBoot$.findTheFile$1(Log.scala:115)
    at net.liftweb.util.LogBoot$._log4JSetup(Log.scala:118)
    at net.liftweb.util.LogBoot$$anonfun$2.apply(Log.scala:96)
    at net.liftweb.util.LogBoot$$anonfun$2.apply(Log.scala:96)
    at net.liftweb.util.LogBoot$.checkConfig(Log.scala:94)
    at
net.liftweb.util.LogBoot$.net$liftweb$util$LogBoot$$_logger(Log.scala:140)
    at net.liftweb.util.LogBoot$$anonfun$3.apply(Log.scala:142)
    at net.liftweb.util.LogBoot$$anonfun$3.apply(Log.scala:142)
    at net.liftweb.util.Log$.rootLogger(Log.scala:26)
    at net.liftweb.util.Log$.error(Log.scala:42)
    at net.liftweb.http.LiftFilter.bootLift(LiftServlet.scala:515)
    at net.liftweb.http.LiftFilter.init(LiftServlet.scala:491)
    at
org.apache.catalina.core.ApplicationFilterConfig.getFilter(ApplicationFilterConfig.java:275)
    at
org.apache.catalina.core.ApplicationFilterConfig.setFilterDef(ApplicationFilterConfig.java:397)
    at
org.apache.catalina.core.ApplicationFilterConfig.<init>(ApplicationFilterConfig.java:108)
    at
org.apache.catalina.core.StandardContext.filterStart(StandardContext.java:3709)
    at
org.apache.catalina.core.StandardContext.start(StandardContext.java:4356)
    at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1045)
    at org.apache.catalina.core.StandardHost.start(StandardHost.java:719)
    at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1045)
    at
org.apache.catalina.core.StandardEngine.start(StandardEngine.java:443)
    at org.apache.catalina.startup.Embedded.start(Embedded.java:825)

But I already put lift-webkit-0.10-20080908.220934-106.jar file in
WEB-INF/lib directory.

Can any one tell me what I'm wrong?

Thank you