严重：由于先前的错误，Context [/ myapp]启动失败

Question

我在tomcat 5.5中使用unpackwars = false部署myapp.war。

我收到此错误

INFO: Deploying web application archive myapp.war
log4j:WARN No appenders could be found for logger (org.apache.catalina.core.ContainerBase.[Catalina].[localhost].[/myapp]).
log4j:WARN Please initialize the log4j system properly.
Jul 22, 2014 6:01:27 PM org.apache.catalina.core.StandardContext start
SEVERE: Error listenerStart
Jul 22, 2014 6:01:27 PM org.apache.catalina.core.StandardContext start
SEVERE: Context [/myapp] startup failed due to previous errors

但它与unpackwars=true合作。我做错了什么？

我该如何解决？