Asynchronous method 'anonymous' should not return void

Can someone helps me resolve this problem I tried everything.
I usually know how to resolve that problem but not with anonymous method

public DelegateCommand EnterButton { get; set; }

public StartPageViewModel()
{
    Title = "title_black.png";
    PasswordPlaceholder = "Lozinka";

    EnterButton = new DelegateCommand( async () => { await enterButtonClicked();});  //<--- Here I am getting that warning
}

public async Task enterButtonClicked()
{

}