Diagnosis
The entered trace data matches an active or scheduled trace in thefollowing components:
Events, columns, and filter conditions
To avoid traces that are more or less the same using system resources,the intended trace cannot be started.

Procedure
If you really require the desired trace, you need to make a (small)change to the definition, to differentiate it from active and scheduledtraces. You can, for example, add an additional output column.