In PWA Project Site sometime the out-of-the-box Workflow 2010 (WF2010) for document library approval is not enabled by default (as below).
And when you try to enable it from the site collection feature, you could get an error message.
When you try to reactivate this feature, you may get the below error message
“A list, survey, discussion board, or document library with the specified title already exists in this Web site. Please choose another title”
This should now resolve the issue.
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