my app does not run

Question

This is my first time trying to create a web mvc application using https://learn.microsoft.com/en-us/learn/modules/msgraph-build-aspnetmvc-apps/3-exercise-create-app
But I can comprehend nd the problem.

Answer 1

the error means the owin identity was not correctly configures in the owin startup:

https://learn.microsoft.com/en-us/azure/active-directory/develop/tutorial-v2-asp-webapp