Database |0 contains a site (Id = |1], Url = |2]) whose id is already associated with a different database (Id = |3], name ...

Database [|0] contains a site (Id = [|1], Url = [|2]) whose id is already associated with a different database (Id = [|3], name = [|4]) in the site map. Consider deleting one of these sites which have conflicting ids.