Error when running application (single-tenant vs multi-tenant)

[hgjura]

I run this app after filling in the details as instructed. I get this error after trying to Login

OpenIdConnectProtocolException: Message contains error: 'invalid_request', error_description: 'AADSTS50194: Application '{id}'({name} is not configured as a multi-tenant application. Usage of the /common endpoint is not supported for such applications created after '10/15/2018'. Use a tenant-specific endpoint or configure the application to be multi-tenant.

I did not see any instructions for this to be a multi-tenant app.