Hi all, is it possible to sort over multiple fields?

I can successfully search on 1 attribute. When I try to search over 2 attributes, i get LDAP Error Code 2 - 00000057 javax.naming.CommunicationError.

I am using AD for my ldap purposes. Here is what i am trying to do:

AggregateDirContextProcessor processor = new AggregateDirContextProcessor processor();
SortControlDirContextProcessor sorter = new SortControlDirContextProcessor("sn");
SortControlDirContextProcessor sorter2 = new SortControlDirContextProcessor("givenName");
processor.addDirContextProcessor(sorter);
processor.addDirContextProcessor(sorter2);

Works if I just feed processor sorter. Does not work if I feed it sorter and sorter2.