Error with email-poller

 Hi,

We are getting following error when we restart serer:

<Warning> <Connector> <BEA-190155> <Compliance checking and validation of the resource adapter ........../suite/suite.ear/email-poller.rar resulted in the following warnings:
The class 'com.appiancorp.ra.emailpoller.EmailPollerRa', which is defined as [<resourceadapter-class>] from [META-INF/ra.xml], should implement java.io.Serializable but does not.>

Any idea?

Thanks,

Jayashri