There was an error sending this message to your bot: HTTP status code InternalServerError

Hi,

I have created Bots in BotFramework portal and have linked up with BotBuilderSDK and have enabled channels like DirectLine, WebChat. It was working fine till today morning we are getting messages as “Sorry, my bot code is having an issue”…It is not working. Any suggestions?..In the error list of DirectLine it is showing as “There was an error sending this message to your bot: HTTP status code InternalServerError”…

Code:

public class MessagesController : ApiController
    {

       
       
        internal static IDialog<CathyFormDialog> MakeRootDialog()
        {
            return Chain.From(() => FormDialog.FromForm(CathyFormDialog.BuildForm));
        }

        /// <summary>
        /// POST: api/Messages
        /// Receive a message from a user and reply to it
        /// </summary>
        /// 
        [ResponseType(typeof(void))]
        public async Task<HttpResponseMessage> Post([FromBody]Activity activity)
        {
            if(activity !=null)
            {
                switch (activity.GetActivityType())
                {
                    case ActivityTypes.Message:

                       

                      
                       await Conversation.SendAsync(activity, () => new TrygBot.TrygDialog());

                        

                        break;
                    case ActivityTypes.ConversationUpdate:
                    case ActivityTypes.ContactRelationUpdate:
                    case ActivityTypes.Typing:
                    case ActivityTypes.DeleteUserData:
                    default:
                        Trace.TraceError($"Unknown activity type ignored: {activity.GetActivityType()}");
                        break;
                }
            }
 
![botframeworkerror](https://cloud.githubusercontent.com/assets/26003233/23301905/42c0c4c0-fab2-11e6-907d-d8098056b90f.png)

![httperror](https://cloud.githubusercontent.com/assets/26003233/23302367/771f0c98-fab4-11e6-9cdd-41cc4e28dcc6.png)