Too many dispatcher configurations have been specified. No more can be added.
Consolidate the dispatcher configurations if possible.
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Try the following links for this error:
http://docs.oracle.com/cd/E16655_01/server.121/e26079/e0.htm
https://community.oracle.com/message/1175028
https://community.oracle.com/message/9530956
https://community.oracle.com/message/1783737
https://community.oracle.com/message/1228927