primefaces cannot be cast to javax.servlet.Filter

primefaces cannot be cast to javax.servlet.Filter

I'm using jsf 2.1 and prime-faces 3.5 with tomcat 7 and javaee 6 on
eclipse Juno .
i facing problem when running my project with tomcat :
Aug 15, 2013 7:40:23 PM org.apache.catalina.core.StandardContext
filterStart
SEVERE: Exception starting filter PPRBean
java.lang.ClassCastException: org.primefaces.examples.view.PPRBean
cannot be cast to javax.servlet.Filter
at
org.apache.catalina.core.ApplicationFilterConfig.getFilter(ApplicationFilterConfig.java:260)
at
org.apache.catalina.core.ApplicationFilterConfig.<init>(ApplicationFilterConfig.java:107)
at
org.apache.catalina.core.StandardContext.filterStart(StandardContext.java:4746)
at
org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5399)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
at
org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1559)
at
org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1549)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)
at java.util.concurrent.FutureTask.run(FutureTask.java:166)
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:724)
this porblem maybe from servlet i'm using 2.5 and added dependencies in
maven but no luck.