Cause
The current session was requested to set a trace event by another session.
The current session was requested to set a trace event by another session.
This is used internally; no action is required.
Try the following links for this error:
http://docs.oracle.com/cd/E16655_01/server.121/e26079/e0.htm
https://community.oracle.com/message/6502753
https://community.oracle.com/message/756857
https://community.oracle.com/message/9446075
https://community.oracle.com/message/2025568
https://community.oracle.com/message/1193289
https://community.oracle.com/message/4497062
https://community.oracle.com/message/1117811
https://community.oracle.com/message/1228927
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