java.lang.NullPointerException: This exception has no message.

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This exception has no message.
java.lang.NullPointerException:
at com.iplanet.services.util.JSSEncryption.initSymmetricKeysAndInitializationVectors(JSSEncryption.java:200)
at com.iplanet.services.util.JSSEncryption.(JSSEncryption.java:176)
at com.iplanet.services.util.Crypt.(Crypt.java:68)
at com.iplanet.dpro.session.SessionID.parseSessionString(SessionID.java:266)
at com.iplanet.dpro.session.SessionID.getSessionServerProtocol(SessionID.java:164)
at com.iplanet.dpro.session.Session.getSessionServiceURL(Session.java:654)
at com.iplanet.dpro.session.Session.getSession(Session.java:526)
at com.iplanet.sso.providers.dpro.SSOProviderImpl.createSSOToken(SSOProviderImpl.java:56)
at com.iplanet.sso.SSOTokenManager.createSSOToken(SSOTokenManager.java:226)
at com.iss.system.security.SecurityFilter.doFilter(Unknown Source)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:213)
at org.apache.catalina.core.ApplicationFilterChain.access$000(ApplicationFilterChain.java:98)
at org.apache.catalina.core.ApplicationFilterChain$1.run(ApplicationFilterChain.java:176)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:172)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:265)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:505)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:212)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:505)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:203)
at com.iplanet.ias.web.connector.nsapi.NSAPIProcessor.process(NSAPIProcessor.java:157)
at com.iplanet.ias.web.WebContainer.service(WebContainer.java:598)

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