Visualization and Modeling SDK (DSL Tools) - Multiple validations - Unable to cast object of type System.Reflection.RuntimeMethodInfo ...

Hello, I'm new in DSL tools, as a consequence I'm following this tutorial to know more about it.

Visualization and Modeling SDK (DSL Tools) - Intro Lab made by Alan Cameron Wills. (https://code.msdn.microsoft.com/Visualization-and-Modeling-313535db#content)

I'm using Visual Studio Enterprise 2015

I have a problem with lab 3 (part 3) of this tutorial page 6 and 7.

When execute the experimental instance of VS with ValidateAttributeNameAsValidIdentifier method only or ValidateFinalStateHasNoOutGoingTransitions I don't have any problem. I mean just one of them.

But when I have both methods, as you can see on the code below, when I try to re-open a model I have the following message from visual studio , and I can't open the model I made.

Thank you in advance.

Message 

Microsoft Visual Studio

     Cannot load '...\Visual Studio 2015\Projects\LanguajeSM\Debugging\Sample.sm'; Unable to cast object of type 'System.Reflection.RuntimeMethodInfo' to type 'System.Reflection.ConstructorInfo'.

namespace Company.LanguajeSM
{
    [ValidationState(ValidationState.Enabled)]
    public partial class State
    {
        ///// <summary>
        ///// CSharp code provider to verify identifiers.
        ///// </summary>
        private static CSharpCodeProvider csharp = new CSharpCodeProvider();


        ///// <summary>
        ///// Warning method to ensure that the Name of a state is :
        ///// - not empty
        ///// - a valid identifier
        ///// </summary>
        [ValidationMethod(ValidationCategories.Open | ValidationCategories.Save | ValidationCategories.Menu)]
        private void ValidateAttributeNameAsValidIdentifier(ValidationContext context)
        {
            // Name is tot empty
            if (string.IsNullOrEmpty(this.Name.Trim()))
            {
                context.LogError(CustomCode.Validation.ValidationResources.EmptyStateNameError,"StateMachine – State - 01", this); // Name is a valid C# identifier
            }
            else if (!csharp.IsValidIdentifier(Name))
            {
                string error = string.Format(System.Globalization.CultureInfo.CurrentUICulture, CustomCode.Validation.ValidationResources.InvalidStateIdentifierError, Name);
                context.LogError(error, "StateMachines – State - 02", this);
            }
        }


        ///// <summary>
        ///// Validation method to ensure that a final state has no outgoing transitions
        ///// </summary>
        [ValidationMethod(ValidationCategories.Open | ValidationCategories.Save | ValidationCategories.Menu)]
        private void ValidateFinalStateHasNoOutgoingTransitions(ValidationContext context)
        {
            if ((Kind == StateKind.Final) && (Successors.Count > 0))
            {
                string error = string.Format(System.Globalization.CultureInfo.CurrentUICulture, CustomCode.Validation.ValidationResources.FinalStateShouldNotHaveOutgoingTransitions, Name);
                context.LogError(error, "StateMachines – State - 03", this);
            }
        }
    }
}