Trying to get safariConsole-log

Hi,

i trying to get the safariConsole-Log accordingly to this article: https://appiumpro.com/editions/37
But it stays empty. Even in my own application i see no entry.

I’m using Appium 15.0 with --relaxed-security. What am i missing?
I have tried 14.0 before.

I’m having C# with Nunit, Appium.WebDriver is 3.0.0.2

    [Test]
    public void testLogging()
    {
        driver.Url = ("https://appiumpro.com/test");
        driver.ExecuteScript("window.onerror=console.error.bind(console)");
        driver.ExecuteScript("console.log('foo.');");
        driver.ExecuteScript("console.warn('bar?');");
        driver.FindElementById("jsErrLink").Click();

        foreach (var line in driver.Manage().Logs.GetLog("safariConsole"))
        {
            Console.WriteLine(line.ToString());
        };
    }