在做Linux下的nginx+tomcat+memcached整合时，启动tomcat报如下错误，谁能帮忙解决下，多谢。

java.util.concurrent.ExecutionException: java.lang.RuntimeException: Error constructing field access class: flex.messaging.HttpFlexSessionFieldAccess
at de.javakaffee.web.msm.BackupSessionService$SynchronousExecutorService.submit(BackupSessionService.java:348)
at de.javakaffee.web.msm.BackupSessionService.backupSession(BackupSessionService.java:205)
at de.javakaffee.web.msm.MemcachedSessionService.backupSession(MemcachedSessionService.java:1076)
at de.javakaffee.web.msm.RequestTrackingHostValve.backupSession(RequestTrackingHostValve.java:244)
tomcat配置如下：
<Manager className="de.javakaffee.web.msm.MemcachedBackupSessionManager"
memcachedNodes="10.100.3.103:11211"
requestUriIgnorePattern=".*\.(png|gif|jpg|css|js|ico|jpeg|htm|html)$"
sessionBackupAsync="false"
sessionBackupTimeout="1800000"
copyCollectionsForSerialization="false"
transcoderFactoryClass="de.javakaffee.web.msm.serializer.kryo.KryoTranscoderFactory"
/>

at de.javakaffee.web.msm.BackupSessionService$SynchronousExecutorService.submit(BackupSessionService.java:348)

Error constructing field access class: flex.messaging.HttpFlexSessionFieldAccess

对应的类，应该是属性写得不对。。。。。。追问

我已经反编译了源码，大概看了下，感觉实现的逻辑并没有什么问题，但不知道就是报错，回头有时间还要做一个这样的例子。

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