Can't restore artifact. Unable to find package

In my project the nuget restore is failing during the build process. It says [restore] Unable to find version '3.1.49909.76' of package 'Code.Biz'. I checked the artifact folder the packages are there. Not sure what is causing the problem. 

Also queried http://*********:8001/guestAuth/app/nuget/v1/FeedService.svc/FindPackagesById()?id=%27Code.Biz%27  but i'm getting an error like

<error><code>NotFoundException</code><message lang="en-US">EdmEntitySet Search is not found</message></error>.

Can someone help me to find out why the nuget packages are served.