Cause
You tried to create an index on a long or lob column using an indirect datastore such as the file or url datastores
You tried to create an index on a long or lob column using an indirect datastore such as the file or url datastores
Use direct datastore or a varchar column
Try the following links for this error:
http://docs.oracle.com/cd/E16655_01/server.121/e26079/drgus.htm
https://community.oracle.com/message/1924708
https://community.oracle.com/message/98459
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