When user login and select a responsibility(custom),he was getting "Page encountered an error,please contact system administrator".The same responsibilty can be access by other users.
As a workaround,we are end dating the user and creating a new user,then he was able to access the responsibility.we have raised an SR for this issue long back but it was closed without solution
oracle.adf.mds.exception.MDSRuntimeException: Unable to find component with absolute reference = /xxttd/oracle/apps/ap/payments/mbook/webui/MBookNewBillPG, XML Path = {1}. Please verify that the reference is valid and the definition of the component exists either on the File System or in the MDS Repository.
This may be related with a incorrect personalization in user level.
follow this document and check:
One User Is Not Able To Access The MES, Error "oracle.apps.fnd.framework.OAException: Could not load application module 'oracle.apps.gmo.instruction.kiosk.server.KioskInstanceInstructionProcessAM'" (Doc ID 2316936.1)
Don't limit yourself with the document. It just gives you the idea.
Check your customization. Check your general personalization.
Anything that may be related a user level failure?