A command was issued that tried to lock the table indicated in the message. Examples of commands that can lock tables are: LOCK TABLE, ALTER TABLE ... ADD (...), and so on.
Use the ALTER TABLE ... ENABLE TABLE LOCK command, and retry the command.
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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/4471193
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