ESS DCs throw error

We have deployed the ESS 603 sps2 version on NW7.0 portal...we are able to see the homepage framework for ess after assigning the portal role, however most of the DC's are throwing this error:

java.lang.NoClassDefFoundError: com.sap.pcuigp.xssutils.pernr.model.grpinfo.Hrxssce_Pernr_Grp_Info 

com.sap.tc.webdynpro.services.exceptions.WDRuntimeException: Failed to create delegate for component com.sap.xss.essceservices.vcceassignmentselection.VcCEAssignmentSelection. (Hint: Is the corresponding DC deployed correctly? Does the DC contain the component?)
	at com.sap.tc.webdynpro.progmodel.generation.ControllerHelper.createDelegate(ControllerHelper.java:110)
	at com.sap.tc.webdynpro.progmodel.generation.DelegatingComponent.<init>(DelegatingComponent.java:51)
	at com.sap.tc.webdynpro.clientserver.cal.ClientComponent.init(ClientComponent.java:382)
	at com.sap.tc.webdynpro.clientserver.cal.ClientComponent.createComponent(ClientComponent.java:940)