issue with word docs opening in browser in SharePoint 2010 Portal

Issue: 

Word Web App cannot open this document for viewing because of an unexpected error.

To view this document, open it in Microsoft Word.

Error Id: eaface98-06b3-4fcc-9113-405f206b8d71, 20120316145832 

Resolution:

I verified the list of the service applications details and services that are running in the farm.

Found that Word Viewing Service Application is not started .I started the service and the word document started rendering in the browser.