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

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java.lang.NullPointerException:
at com.sun.identity.authentication.modules.ldap.LDAP.initializeLDAP(LDAP.java:246)
at com.sun.identity.authentication.modules.ldap.LDAP.processLoginScreen(LDAP.java:595)
at com.sun.identity.authentication.modules.ldap.LDAP.process(LDAP.java:427)
at com.sun.identity.authentication.spi.AMLoginModule.wrapProcess(AMLoginModule.java:772)
at com.sun.identity.authentication.spi.AMLoginModule.login(AMLoginModule.java:923)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at com.sun.identity.authentication.jaas.LoginContext.invoke(LoginContext.java:216)
at com.sun.identity.authentication.jaas.LoginContext.login(LoginContext.java:132)
at com.sun.identity.authentication.service.AMLoginContext.runLogin(AMLoginContext.java:425)
at com.sun.identity.authentication.server.AuthContextLocal.submitRequirements(AuthContextLocal.java:480)
at com.sun.identity.authentication.UI.LoginViewBean.processLoginDisplay(LoginViewBean.java:1226)
at com.sun.identity.authentication.UI.LoginViewBean.processLogin(LoginViewBean.java:704)
at com.sun.identity.authentication.UI.LoginViewBean.forwardTo(LoginViewBean.java:431)
at com.iplanet.jato.ApplicationServletBase.dispatchRequest(ApplicationServletBase.java:981)
at com.iplanet.jato.ApplicationServletBase.processRequest(ApplicationServletBase.java:615)
at com.iplanet.jato.ApplicationServletBase.doPost(ApplicationServletBase.java:473)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:816)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:917)
at org.apache.catalina.core.ApplicationFilterChain.servletService(ApplicationFilterChain.java:398)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:304)
at com.sun.identity.setup.AMSetupFilter.doFilter(AMSetupFilter.java:86)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:217)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:185)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:275)
at org.apache.catalina.core.StandardContextValve.invokeInternal(StandardContextValve.java:255)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:188)
at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:586)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:556)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:187)
at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:586)
at com.sun.webserver.connector.nsapi.NSAPIProcessor.service(NSAPIProcessor.java:160)

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