SAP EP 7.3 Upgrade related error

Problem - Getting import related errors for the following imports

import com.sapportals.portal.navigation.NavigationEventsHelperService;

import com.sapportals.portal.pb.fpm.IFPMEvent;

import com.sapportals.portal.pb.fpm.IFPMListener;

import com.sapportals.portal.pb.fpm.IFPMTopic;

import com.sapportals.portal.pb.fpm.INavigationTopic;

Solution : Try to add DC in project references- tc/ep/pagebuilder/api which is under EP-runtime

Keywords : SAP upgrade, SAP EP 7.3, Portal and Collaoration