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

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This exception has no message.
java.lang.NullPointerException:
at com.iplanet.dpro.session.service.SessionConstraint.getSessionQuota(SessionConstraint.java:251)
at com.iplanet.dpro.session.service.SessionConstraint.checkQuotaAndPerformAction(SessionConstraint.java:139)
at com.iplanet.dpro.session.service.InternalSession.activate(InternalSession.java:711)
at com.sun.identity.authentication.service.LoginState.activateSession(LoginState.java:855)
at com.sun.identity.authentication.service.AMLoginContext.runLogin(AMLoginContext.java:420)
at com.sun.identity.authentication.server.AuthContextLocal.submitRequirements(AuthContextLocal.java:495)
at com.sun.identity.authentication.UI.LoginViewBean.processLoginDisplay(LoginViewBean.java:1187)
at com.sun.identity.authentication.UI.LoginViewBean.processHttpCallback(LoginViewBean.java:923)
at com.sun.identity.authentication.UI.LoginViewBean.getLoginDisplay(LoginViewBean.java:808)
at com.sun.identity.authentication.UI.LoginViewBean.processLogin(LoginViewBean.java:713)
at com.sun.identity.authentication.UI.LoginViewBean.forwardTo(LoginViewBean.java:426)
at com.iplanet.jato.ApplicationServletBase.dispatchRequest(ApplicationServletBase.java:981)
at com.iplanet.jato.ApplicationServletBase.processRequest(ApplicationServletBase.java:615)
at com.iplanet.jato.ApplicationServletBase.doGet(ApplicationServletBase.java:459)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:787)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:908)
at org.apache.catalina.core.StandardWrapperValve.invokeServletService(StandardWrapperValve.java:771)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:322)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:509)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:212)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:509)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:209)
at com.iplanet.ias.web.connector.nsapi.NSAPIProcessor.process(NSAPIProcessor.java:161)
at com.iplanet.ias.web.WebContainer.service(WebContainer.java:580)

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