Cause
You attempted to set the value of a parameter while the task was being executed. This parameter cannot be changed until the task finishes its execution.
You attempted to set the value of a parameter while the task was being executed. This parameter cannot be changed until the task finishes its execution.
Verify the status of the task and retry the operation.
Try the following links for this error:
http://docs.oracle.com/cd/E16655_01/server.121/e26079/e12700.htm
https://community.oracle.com/message/3229900
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