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In uPortal 2 the file was named personDirectory.xml and located in /uPortal/properties. In uPortal 3 the file is named personDirectoryContext.xml and located in /uPortal/portal-impl/src/main/resources/properties/contexts.
Rename the Package
Replace all instances of org.jasig.portal.services.persondir in the file with org.jasig.services.persondir