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

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This exception has no message.
java.lang.NullPointerException:
at com.iplanet.am.sdk.AMUserImpl.getAllRoleDNs(AMUserImpl.java:204)
at com.iplanet.am.console.settings.UserSettings.getRolesAssignedToUser(UserSettings.java:300)
at com.iplanet.am.console.settings.UserSettings.(UserSettings.java:75)
at com.iplanet.am.console.settings.UserSettings.getUserSettings(UserSettings.java:198)
at com.iplanet.am.console.base.model.AMModelBase.getUserSettings(AMModelBase.java:2690)
at com.iplanet.am.console.base.model.AMMenuValidatorImpl.removeHiddenMenus(AMMenuValidatorImpl.java:502)
at com.iplanet.am.console.base.model.AMMenuValidatorImpl.validateRootSuffixMenuOptions(AMMenuValidatorImpl.java:160)
at com.iplanet.am.console.user.model.UMNavModelImpl.validateNavigationalMenuOptions(UMNavModelImpl.java:617)
at com.iplanet.am.console.user.model.UMNavModelImpl.getSuperMenu(UMNavModelImpl.java:606)
at com.iplanet.am.console.user.model.UMNavModelImpl.getShowMenuOptions(UMNavModelImpl.java:276)
at com.iplanet.am.console.user.UMHomeViewBean.getPrevViewedViewBean(UMHomeViewBean.java:144)
at com.iplanet.am.console.user.UMHomeViewBean.forwardTo(UMHomeViewBean.java:92)
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:747)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:860)
at sun.reflect.GeneratedMethodAccessor58.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at java.security.AccessController.doPrivileged(Native Method)
at org.apache.catalina.security.SecurityUtil.execute(SecurityUtil.java:282)
at org.apache.catalina.security.SecurityUtil.doAsPrivilege(SecurityUtil.java:165)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:257)
at org.apache.catalina.core.ApplicationFilterChain.access$000(ApplicationFilterChain.java:55)
at org.apache.catalina.core.ApplicationFilterChain$1.run(ApplicationFilterChain.java:161)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:157)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:263)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:551)
at org.apache.catalina.core.StandardContextValve.invokeInternal(StandardContextValve.java:225)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:173)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:551)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:161)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:551)
at com.sun.enterprise.web.connector.httpservice.HttpServiceProcessor.process(HttpServiceProcessor.java:221)
at com.sun.enterprise.web.HttpServiceWebContainer.service(HttpServiceWebContainer.java:2072)

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