Error when expanding 'Wen Dynpro Application' in 'Content Administration'

Hi All,
I m using CE 7.1 portal.
In my Content Administration -> Portal Content, when im trying to expand Web Dynpro Applications,
its throwing null pointer exception. Giving following error:
java.lang.NullPointerException
    at com.sap.tc.webdynpro.serverimpl.core.deployment.DeploymentXMLParser.processXML(DeploymentXMLParser.java:186)
    at com.sap.tc.webdynpro.serverimpl.core.deployment.DeploymentXMLParser.<init>(DeploymentXMLParser.java:140)
    at com.sap.tc.webdynpro.serverimpl.core.deployment.AbstractWebModule.initializeDeployableObjectParts(AbstractWebModule.java:304)
    at com.sap.tc.webdynpro.serverimpl.core.deployment.AbstractWebModule.getParts(AbstractWebModule.java:132)
    at com.sap.tc.webdynpro.serverimpl.core.deployment.AbstractDeployableObject.getParts(AbstractDeployableObject.java:115)
    ... 78 more
What could be the reason for the same?
How can i mend it?
Thanks and Regards,
Sakshi

Thanks Santhosh for prompt reply.... i restarted the server and after that its working fine....
In case, if i ll face some issue again will get back to you.... thanks
Sakshi

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com.sap.tc.webdynpro.services.sal.core.DispatcherException: The requested deployable object 'local/J08_Flugdat_Daventdcflight~xxx.com' and application 'FlightListApp' are not deployed on the server. Please check the used URL for typos.
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Thanks a lot in advanced!
Best regards
Christoph

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