Messages and subscriptions

Hi,

I'm trying to use Messages and MessageSubscription 

but I cant find a full sample code in the documentation so I tried it like this

using cAlgo.API;

namespace cAlgo.Robots
{
    [Robot(AccessRights = AccessRights.None)]
    public class TestEvents : Robot
    {
        protected override void OnStart()
        {
            Messages.Send("Test", "Test");
        }
        
        protected override void OnTick()
        {
            // Handle price updates here
        }

        protected override void OnStop()
        {
            // Handle cBot stop here
        }
    }
}

but Im getting an error that says 

Crashed in OnStart with MissingMethodException: Method not found: 'cAlgo.API.Messages cAlgo.API.Internals.Algo.get_Messages()'.

Target Framework is .NET 6 and I also select compiler to 6.0

cTrader version is 5.1.14.xxxx

Is there something I need to add?

I tested it in ICMarkets and Pepperstone