then try the following.
Option #1: Clear everything from logs folder
1. Go to Services.msc
2. Stop the "Sharepoint Tracing Service"
3. Navigate to C:\Program Files\Common Files\microsoft shared\Web Server Extensions\15\LOGS and clear everything.
4. Start the "Sharepoint Tracing Service"
5. Try to open ULSViewer and check for real-time logs
In case, if you still face the issue, try the next option
Option #2 : Change the default location of ULS log
1. Go to Central admin site
2. Got to Monitoring -> Configure Diagnostic logging
3. Change the "Trace Log Path" to any folder, say C:\ULSLogs
4. Try to open ULSViewer and check for real-time logs
Hope it helps !!
