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

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java.lang.NullPointerException:
at org.dspace.authenticate.LDAPAuthentication.authenticate(LDAPAuthentication.java:338)
at org.dspace.authenticate.AuthenticationServiceImpl.authenticateInternal(AuthenticationServiceImpl.java:115)
at org.dspace.app.xmlui.utils.AuthenticationUtil.authenticate(AuthenticationUtil.java:121)
at org.dspace.app.xmlui.aspect.eperson.LDAPAuthenticateAction.act(LDAPAuthenticateAction.java:71)
at org.apache.cocoon.sitemap.impl.DefaultExecutor.invokeAction(DefaultExecutor.java:55)

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