Hi Chiru,
did did you perform the necessary post installation activities in the sandbox. Errors in BSP pages are quite common after an upgrade. See this blog for a collection of necessary post installations activities as well as errors I encounter during an EHP3 upgrade:
http://scn.sap.com/community/crm/upgrades-and-enhancement-packs/blog/2014/02/21/sap-crm-ehp3-upgrade
Christian