This episode has since been downloaded and processed successfully using a different nzb file. This message keeps repeating over and over in the log.
Import failed, path does not exist or is not accessible by Sonarr: C:\Users\Ron\Downloads\complete\Outlander.S02E02.720p.HDTV.X264-DIMENSION.mkv
Update: Think I’ve found a way to get rid of it. Re-downloading this same file as in the message. Hopefully it will clear when it finishes.