Cause
An attempt was made to drop a column from a system table.
An attempt was made to drop a column from a system table.
This action is not allowed
Try the following links for this error:
http://docs.oracle.com/cd/E16655_01/server.121/e26079/e12700.htm
https://community.oracle.com/message/10386924
https://community.oracle.com/message/4268279
https://community.oracle.com/message/9624451
https://community.oracle.com/message/4226839
https://community.oracle.com/message/9551408
https://community.oracle.com/message/2508015
https://community.oracle.com/message/1240968
https://community.oracle.com/message/9283873
https://community.oracle.com/message/914906
https://community.oracle.com/message/1233867
https://community.oracle.com/message/2063412
https://community.oracle.com/message/9283867
https://community.oracle.com/message/9283866
https://community.oracle.com/message/9283835
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