the query plan for your query is invoking a matches operator functionally rather than as an index rowsource. The matches operator does not support functional invocation
add optimizer hints so that all matches operators are performed through index scans
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Try the following links for this error:
http://docs.oracle.com/cd/E16655_01/server.121/e26079/drgus.htm
https://community.oracle.com/message/10019083