NLog.Web: Main() Error:System.ArgumentOutOfRangeException:“Index and count must refer to a location within the string.”

• VS version:15.4.0
• Windows version:Windows10
• ASP.NET CORE:2.0
• NLog:5.0.0-beta11
• NLog.Web.AspNetCore:4.5.0-rc2

Program=>Main:

var logger = NLogBuilder.ConfigureNLog("NLog.config").GetCurrentClassLogger();
try
 {
       logger.Debug("init main");
       BuildWebHost(args).Run();
}
catch (Exception e)
{
       logger.Error(e, "Stopped program because of exception");
        throw;
}