Portal error after updating to SP10

Hi experts

After updating the portal to SAP NW 7.4 SP10 (from SP8) we are getting the following error:java.lang.NoSuchMethodError: com.sap.portal.pcm.alias.IAliases.getTargetsOfDefaultSystemAliases(Lcom/sap/security/api/IPrincipal;)Ljava/util/Map;

Any ideas?

Cheers