trace file aa...aa cannot be opened. error number=bbb

aa...aa: Trace file name (string of up to 255 characters)

bbb: Error number (errno of the open system call)

S: Continues processing without outputting trace information to the file.

O: To output trace information to the file, terminate the offline tester and remove the cause of the error indicated by the error number. Then, reactivate the offline tester.