[Solved] ASP.Net MVC Error: The type or namespace name Model could not be found

I have face an error Error CS0246 The type or namespace name 'YouTubeDataModel' could not be found (are you missing a using directive or an assembly reference?)

using Cofoundry.Domain;
using Cofoundry.Plugins.YouTube.Domain;
using System.ComponentModel.DataAnnotations;

namespace PublisherFinder.Cofoundry.PageBlockTypes.ViemoVideo
{
    public class YouTubeDataModel : IPageBlockTypeDataModel, IPageBlockTypeDisplayModel
    {
        [Required]
        [YouTube]
        public YouTubeVideo Video { get; set; }
    }
}

I have make this class for YouTube Video and call this .cshtml file

@model YouTubeDataModel

@inject ICofoundryBlockTypeHelper<YouTubeDataModel> Cofoundry

Please help me