Switch off the trace or use another function -> Long text

What causes this issue?

The trace is still switched on for one or several trace types. The
system expects all trace types to be switched off before displaying the
trace list. You can switch the traces on and off using transaction
ST05.
If you want to generate the performance trace list with a trace still
switched on, you can choose "Performance Trace" -> Display Trace
Without First Switching Off". You can choose to display the basic or
extended list.
If you do want to dislay the performance trace without switching it
off, the end time for the trace list display will be determined and
then initialized once you display the list. You can overwrite this
time.

System Response

The system terminates trace display and allows you to restart.

How to fix this error?

To switch off all traces, use transaction ST05.
You can also use the function "Display Trace Without First Switching
Off".

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

Error message extract from SAP system. Copyright SAP SE.