Resolving No Plugin Have Been Selected From the List Error

 class CrmPlugin:IPlugin
    {
        public void Execute(IServiceProvider serviceProvider)
        {
            IPluginExecutionContext context = (IPluginExecutionContext)serviceProvider.GetService(typeof(IPluginExecutionContext));
            if (context.InputParameters.Contains("Target") && context.InputParameters["Target"] is Entity)
            {
                Entity entity = (Entity)context.InputParameters["Target"];
                if (entity.LogicalName != "Producer")
                {
                    return;
                }

                IOrganizationServiceFactory serviceFactory = null;
                serviceFactory = (IOrganizationServiceFactory)serviceProvider.GetService(typeof(IOrganizationServiceFactory));
                IOrganizationService service = serviceFactory.CreateOrganizationService(context.UserId);

                try
                {
                    // Check UserInput field in a form in Manager entity for the phrase Action.

                    if (entity.Attributes["UserInput"].ToString() == "Test")
                        {
                            entity.Attributes["ViewUserInput"] = "Test Successful";
                        }                    

                }

                catch 
                {

                }
            }
        }
    }