Recently, I was trying to create a new site collection of type “Publishing” but I get kept the following errors.

Dependency feature with id c9c9515d-e4e2-4001-9050-74f980f93160 for feature 'ExpirationWorkflow' (id: c85e5759-f323-4efb-b548-443d2216efb5) is not installed.

On a quick bing search, the feature id c9c9515d-e4e2-4001-9050-74f980f93160  corresponds to “OffWFCommon” feature. So, I went to my 14 hive and did a quick lookup. To my surprise, the feature files were already in the file system. Now, instead of trying to figure out why this happened, I just wanted to move on with my project. So, I ran the following powershell command. This command basically, re-attaches the orphaned features in feature folder.

INSTALL-SPFEATURE -PAth "OffWFCommon"

And Voila, now, I was able to create my test publishing site just fine. Hope this helps someone else.