Hi,
We need some details:
1. What OS version do you have?
2. What MCUXpresso IDE version?
3. What device/board target?
4. What SDK version?
5. What debug probe?
6. From "SWO Trace Config" view, can you press "Change" button then "Detect" and "OK"? Do you obtain any error here?
7. Do you execute SWO clock and pinmux setting (for proper SWO usage)?
8. If step 7 is done, can you press "Clean Up Debug" from main window's toolbar and try again?
Regards,
MCUXpresso IDE Support