You attempted to export an assessment that uses a QoS definition you created. You specified that the assessment should be exported into a directory that already contains a servqual.dat file, a file that stores user-configured QoS definitions. If you export the assessment into this directory, the existing servqual.dat file will be overwritten by the servqual.dat file in the exported assessment.
Click Yes if you want to replace the servqual.dat file with the one you are trying to export.
Otherwise, click No and select a different directory where the exported assessment will be saved. Or click Cancel to cancel the export operation.