One of the most common errors we face while working on a old project is build failure ,
this happens and the error logs are clearly saying what needs to be done.
some things we can do to solve the issue :
Solution 1: check NuGet restore option in VS and check for the source :
the below settings should solve most of the issues with old project restore :
URL is : http://api.nuget.org/v3/index.json
Solution 2 : Deleting %AppData%\Roaming\NuGet\NuGet.Config and restarting VS.
Solution 3 : Use a NuGet config file. To work around this, Try creating a new nuget.config file and populate it with the basic content it needs for the project to work. Here's the basic nuget.config file sample.
<?xml version="1.0" encoding="utf-8"?><configuration><packageSources><clear /><add key="NuGet Public" value="https://api.nuget.org/v3/index.json" /></packageSources></configuration>If you have a better approach do reach out in the comment section below