Error: Stack is empty exception in Bot Framework

Question

Hi,

I created a chatbot by Bot Framework and I implemented a Reset option in order to delete the conversation e grant to the user to begin a new conversation.

// MessageController.cs
public async Task Post([FromBody]Activity activity)
{
  await Conversation.SendAsync(activity, () => new RootDialog().DefaultIfException());
  return Request.CreateResponse(HttpStatusCode.OK);  <- Stack is empty Exception
}
// RootDialog.cs
private void ShowMenuOptions(IDialogContext context)
{
    List<string> optionList = new List<string>();
    optionList.Add("Info");
    optionList.Add("Support");
    optionList.Add("Reset");

    string prompt ="How can I help you?";

    PromptDialog.Choice(context, this.OnOptionSelected, (IEnumerable<string>)optionList, prompt, retry, attempts);
}

private async Task OnOptionSelected(IDialogContext context, IAwaitable<string> result)
{
    try
    {
        string optionSelected = await result;

        switch (optionSelected)
        {
            case "Reset":
                context.Reset();
                context.ConversationData.Clear();
                context.PrivateConversationData.Clear();
                context.UserData.Clear();
                break;
        }
    }
}

When an user chooses reset option, the bot answers with "Sorry, my bot code is having an issue."

Debugging the code I see that the exception triggers after context.Reset().

 

Can anybody help me and solve it?