A problem with mix phx.server please, help))

Hi) Every time I run mix phx.server I get:

[warn] Phoenix is unable to create symlinks. Phoenix' code reloader will run considerably faster if symlinks are allowed. On Windows, the lack of symlinks may even cause empty assets to be served. Luckily, you can address this issue by starting your Windows terminal at least once with "Run as Administrator" and then running your Phoenix application.
[error] Failed to start Ranch listener HelloWeb.Endpoint.HTTP in :ranch_tcp:listen([cacerts: :..., key: :..., cert: :..., port: 5432]) for reason :eaddrinuse (address already in use)

[info] Application hello exited: Hello.Application.start(:normal, []) returned an error: shutdown: failed to start child: HelloWeb.Endpoint
    ** (EXIT) shutdown: failed to start child: {:ranch_listener_sup, HelloWeb.Endpoint.HTTP}
        ** (EXIT) shutdown: failed to start child: :ranch_acceptors_sup
            ** (EXIT) {:listen_error, HelloWeb.Endpoint.HTTP, :eaddrinuse}
** (Mix) Could not start application hello: Hello.Application.start(:normal, []) returned an error: shutdown: failed to start child: HelloWeb.Endpoint
    ** (EXIT) shutdown: failed to start child: {:ranch_listener_sup, HelloWeb.Endpoint.HTTP}
        ** (EXIT) shutdown: failed to start child: :ranch_acceptors_sup
            ** (EXIT) {:listen_error, HelloWeb.Endpoint.HTTP, :eaddrinuse}

P.S. I am a maximum noob and launching a phoenix is ​​generally the first thing I do in programming in my life) Tell me how to fix the error?`