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

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This exception has no message.
java.lang.NullPointerException:
at org.identityconnectors.ldap.LdapConnection.detectServerType(LdapConnection.java:318)
at org.identityconnectors.ldap.LdapConnection.getServerType(LdapConnection.java:310)
at org.identityconnectors.ldap.schema.LdapSchemaBuilder.buildSchema(LdapSchemaBuilder.java:87)
at org.identityconnectors.ldap.schema.LdapSchemaBuilder.getSchema(LdapSchemaBuilder.java:62)
at org.identityconnectors.ldap.schema.LdapSchemaMapping.schema(LdapSchemaMapping.java:107)
at org.identityconnectors.ldap.search.LdapSearch.getAttributesReturnedByDefault(LdapSearch.java:84)
at org.identityconnectors.ldap.search.LdapSearch.getAttributesToGet(LdapSearch.java:344)
at org.identityconnectors.ldap.search.LdapSearch.execute(LdapSearch.java:120)
at org.identityconnectors.ldap.LdapConnector.executeQuery(LdapConnector.java:109)
at org.identityconnectors.ldap.LdapConnector.executeQuery(LdapConnector.java:57)
at org.identityconnectors.framework.impl.api.local.operations.SearchImpl.rawSearch(SearchImpl.java:105)
at org.identityconnectors.framework.impl.api.local.operations.SearchImpl.search(SearchImpl.java:82)
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:597)
at org.identityconnectors.framework.impl.api.local.operations.ConnectorAPIOperationRunnerProxy.invoke(ConnectorAPIOperationRunnerProxy.java:93)
at undefined.$Proxy7.search(Unknown Source)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.identityconnectors.framework.impl.api.local.operations.ThreadClassLoaderManagerProxy.invoke(ThreadClassLoaderManagerProxy.java:107)
at undefined.$Proxy7.search(Unknown Source)
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:597)
at org.identityconnectors.framework.impl.api.BufferedResultsProxy$BufferedResultsHandler.run(BufferedResultsProxy.java:162)

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