2510543 - "Could not create a valid Comparator instance" error in WPC

• The WPC (Web Page Composer) layout templates have been transported from another system or the KMC-WPC component has been redeployed
• The Content Library under the Area Management Role is then accessed
• The following System Error appears:
  
  Could not create a valid Comparator instance for the given metaname wpc:wpc_wcm_displayname_region
  
  

In the Defult trace the following errors can be found:

#EP-KM-FWK-RF#sap.com/com.sap.netweaver.bc.util#C0000A82368005F900000000000050ED#456839850000000004#sap.com/com.sap.km.cm#com.sapportals.wcm.WcmException.WcmException(118)#sahug#148800A44E8736411E79E5C00001B3AD2AA#add6cb81736411e7c5d400001b3ad2aa0#Thread[HTTP Worker [@240415691],5,Dedicated_Application_Thread]#Plain##
com.sap.nw.pcc.km.property.comparator.WpcDisplayNameComparator java.lang.ClassNotFoundException: com.sap.nw.pcc.km.property.comparator.WpcDisplayNameComparator
at com.sapportals.wcm.crt.CrtClassLoaderRegistry.findClass(CrtClassLoaderRegistry.java:187)
at java.lang.ClassLoader.loadClass(ClassLoader.java:376)
at java.lang.ClassLoader.loadClass(ClassLoader.java:317)
at java.lang.Class.forName0(Native Method)

#EP-KM-CM#sap.com/com.sap.km.cm.ui.flex#C0000A82368005F900000001000050ED#456839850000000004#sap.com/com.sap.km.cm#com.sapportals.wcm.rendering.collection.DefaultResourcePropertyComparator#sahug#148800A44E8736411E79E5C00001B3AD2AA#add6cb81736411e7c5d400001b3ad2aa0#Thread[HTTP Worker [@240415691],5,Dedicated_Application_Thread]#Plain##
Could not create a valid Comparator instance for the given property name java.lang.ClassNotFoundException: com.sap.nw.pcc.km.property.comparator.WpcDisplayNameComparator#

#EP-KM-FWK-RF#sap.com/com.sap.netweaver.bc.util#C0000A82368005F900000002000050ED#456839850000000004#sap.com/com.sap.km.cm#com.sapportals.wcm.WcmException.WcmException(118)#sahug#148800A44E8736411E79E5C00001B3AD2AA#add6cb81736411e7c5d400001b3ad2aa0#Thread[HTTP Worker [@240415691],5,Dedicated_Application_Thread]#Plain##
Could not create a valid Comparator instance for the given metaname wpc:wpc_wcm_displayname_region java.lang.NullPointerException: Could not create a valid Comparator instance for the given metaname wpc:wpc_wcm_displayname_region

• SAP NetWeaver 7.3
• SAP enhancement package 1 for SAP NetWeaver 7.3
• SAP NetWeaver 7.4
• SAP Netweaver 7.5

Enterprise Portal 7.30, EP 7.30, Enterprise Portal 7.31, EP 7.31, Enterprise Portal 7.40, EP 7.4, Enterprise Portal 7.50, EP 7.5, Knowledge Management , KBA , EP-KM-WPC , Web Page Composer , EP-PIN-WPC , Web Page Composer , Problem