Cause
An attempt was made to access a table with columns in partially dropped state (i.e., drop column operation was interrupted).
An attempt was made to access a table with columns in partially dropped state (i.e., drop column operation was interrupted).
Submit ALTER TABLE DROP COLUMNS CONTINUE to complete the drop column operation before accessing the table.
Try the following links for this error:
http://docs.oracle.com/cd/E16655_01/server.121/e26079/e12700.htm
https://community.oracle.com/message/995787
https://community.oracle.com/message/4063272
https://community.oracle.com/message/9334514
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