The notice shall in all cases be served personally or by registered mail upon each person entitled by law to recover damages in the action, unless the plaintiff shall file an affidavit that the identity or whereabouts of any such person is unknown to him, after diligent search, in which case the plaintiff shall cause the notice to be advertised once in the newspaper of general circulation published in Erie County, and once in the Erie County Legal Journal. Affidavit of service of notice shall be filed.
Eri. Cnty. Pa. 2205