title: How To Upgrade "Abp-zero-Template" in .Net Core and Angular
body: <p>I Have been trying this for several days.I am facing an error while up-gradation.I have upgraded all ABP nuget packages and downloaded dotnet core 3.1(SDK) and In Angular, AngularCLI is updated but "abp-zero-template" is not also getting the error in other related ABP modules too.
  <a href="https://i.stack.imgur.com/VsPkQ.png" rel="nofollow noreferrer">Error in Startup.cs</a>
  <a href="https://i.stack.imgur.com/pn9Gi.png" rel="nofollow noreferrer">Program .cs</a> <a href="https://i.stack.imgur.com/gOqdx.png" rel="nofollow noreferrer">NGCC Error</a>. 
  I have removed node_modules and reinstall it again but still getting the same error</p>