Greeting
Since today manager server was starting every morning without problem.
Since today I am facing this, any idea
Also not sure why it is asking for .NET because as also per reply to an issue you raised in 2021 it made clear that it is not needed.
Always make sure that your Windows installation is correct. Secondly always ensure that you have the latest version of Manager, i.e. follow https://www2.manager.io/server/installation/windows/
Fixed. Reinstall Manager Server