Unable to register custom workflow activity on MS CRM 2015 Online

Question

Hi All,
I am trying to register custom workflow activity using plugin registration tool on MS CRM 2015 Online.
Error says that 'No Plugin have been selected from list. Please select atleast one and try again'
In short my assembly is not considered as custom workflow activity.
I am giving my code let me know, If any thing is wrong.
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Activities;
using Microsoft.Xrm.Sdk;
using Microsoft.Xrm.Sdk.Workflow;
namespace Training.SamplePlugin
    public class SampleCustomworkflow : CodeActivity
        [Input("Birthday")]
        public InArgument<DateTime> BirthDate { get; set; }
        [Output("NextBirthday")]
        public OutArgument<DateTime> NextBirthDay { get; set; }
        protected override void Execute(CodeActivityContext executionContext)
            //Create the tracing service
            ITracingService tracingService = executionContext.GetExtension<ITracingService>();
            //Create the context
            IWorkflowContext context = executionContext.GetExtension<IWorkflowContext>();
            IOrganizationServiceFactory serviceFactory = executionContext.GetExtension<IOrganizationServiceFactory>();
            IOrganizationService service = serviceFactory.CreateOrganizationService(context.UserId);
            if (context.PrimaryEntityName.ToLowerInvariant() == "contact")
                DateTime birthDate = BirthDate.Get<DateTime>(executionContext);
                DateTime nextBirthDate = new DateTime(DateTime.Now.AddYears(1).Year, birthDate.Month, birthDate.Day);
                //NextBirthDay.Set(executionContext, nextBirthDate);
                Entity newContact = new Entity();
                newContact.LogicalName = "contact";
                newContact.Id = context.PrimaryEntityId;
                newContact["new_nextbirthday"] = nextBirthDate;
                service.Update(newContact);
If code is correct then has somebody faced this kind of issue earlier, what is resolution.
Thanks
Apurv

Answer 1

Have your signed your assembly ??
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