In WCMS Cockpit,Clicking On "Go to Live Edit" button and "Launch Preview" link throwing Exception

Steps I followed 1. I login in CMS 2. I select a catalog - Staged version 3. I search for "Product Detail page" 4. I open the page 5. I click on"Go to Live Edit" button directly on this page 6. I click on Preview context 7. I launch the preview

The Steps 5 and 7 throw an exception and I am unable to see the preview of the site.Rather I get to see the page(Page Attcahed) On seeing the Logs I could see the Null Pointer Exception(Attached Logs)

Please help.

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