SharePoint Server 2019 Search Content Source gives error already exists.

Question

When I create Search Content Source and add URL in Start Addresses and opt Crawl Setting to "Crawl everything under the hostname for each start address" it gives me error. Even though I have checked into all content sources and that URL does not exist in any of the content source. What should I do now ? I can reset the index as we have lots of sites with huge data and not in a position to reset index. Kindly suggest any way to add that URL into Content Source , Thanks.