Assuming you haven't created and moprh assets of your own it's probably a bug in a character or morph set. View>Troubleshooting>View Log, scroll to the end, and search backwards for "duplicate" should find the entries, which will tell you the name of at least one of the files involved.
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Assuming you haven't created and moprh assets of your own it's probably a bug in a character or morph set. View>Troubleshooting>View Log, scroll to the end, and search backwards for "duplicate" should find the entries, which will tell you the name of at least one of the files involved.