Help with exception?

Have you guys ever run into this?

I appreciate any help. Thanks!

 exception(s): Exception #0 (MagentoFrameworkExceptionLocalizedException): Invalid Document Element 'route': Duplicate key-sequence ['sitemap'] in unique identity-constraint 'uniqueRouteFrontName'. Line: 4 exception(s): Exception #0 (MagentoFrameworkExceptionLocalizedException): Invalid Document Element 'route': Duplicate key-sequence ['sitemap'] in unique identity-constraint 'uniqueRouteFrontName'. Line: 4 

submitted by /u/nitro535
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