How top open the exiftool output window

[DONUSA]

I've got a yellow triangle.  The popup message says to check the "exiftool output window".  Not obvious how I do that and can't find it explained in any of the post that contain the string "exiftool output window".  

Sorry for the rookie question, but I am stumped.  By the way, I tried to rescan and the yellow triangle remains.  

[Mario]

View menu > Panels > Output Panel.
See: The Output Panel for more information.

If ExifTool encountered a problem, the tooltip of the yellow triangle should also show the error message.
It will also have been logged to the log file.

See also The Warning Icon for related info.

All files with Exiftool Errors are also shown in the Dashboard for your convenience.