You can use an ETW Viewer to record messages from the application that might provide more details. I attached an ETW Viewer you can use. Just launch the ETW Viewer.exe and go to the "All Events" tab and after launching FlexLogger and getting the error, press the Update button in ETW and save the log and post it so we can review what the issue is. It would also be helpful if you could provide the version of FlexLogger you are using.