Nop 4.10 : No field was found backing property 'NewsCategoriesMapping' of entity type 'NewsItem'

InvalidOperationException: No field was found backing property 'NewsCategoriesMapping' of entity type 'NewsItem'. Lazy-loaded navigation properties must have backing fields. Either name the backing field so that it is picked up by convention or configure the backing field to use.

My classes :
1.MiscNewsItem

namespace Nop.Plugin.Misc.GetNewsItem.Manager.Domain
{
    public partial class MiscNewsItem : BaseEntity, ISlugSupported, IStoreMappingSupported, ILocalizedEntity, IAclSupported
    {
        private ICollection<NewsItemComment> _newsComments;
        private ICollection<NewsCategoryMapping> _newsCategories;

        /// <summary>
        /// Gets or sets the news title
        /// </summary>
        public string Title { get; set; }

        /// <summary>
        /// Gets or sets the short text
        /// </summary>
        public string ShortDescription { get; set; }

        /// <summary>
        /// Gets or sets the full text
        /// </summary>
        public string FullDescription { get; set; }

        /// <summary>
        /// Gets or sets the meta keywords
        /// </summary>
        public string MetaKeywords { get; set; }

        /// <summary>
        /// Gets or sets the meta description
        /// </summary>
        public string MetaDescription { get; set; }
        /// <summary>
        /// Gets or sets the meta title
        /// </summary>
        public string MetaTitle { get; set; }
        /// <summary>
        /// Gets or sets a value indicating whether the news item is published
        /// </summary>
        public int PictureId { get; set; }
        /// <summary>
        /// Gets or sets a value indicating whether the news post comments are allowed
        /// </summary>
        public bool AllowComments { get; set; }
        /// <summary>
        /// Gets or sets a value indicating whether the entity is limited/restricted to certain stores
        /// </summary>
        public bool LimitedToStores { get; set; }
        /// <summary>
        /// Gets or sets a value indicating whether the entity is subject to ACL
        /// </summary>
        public bool SubjectToAcl { get; set; }
        public int TotalView { get; set; }
        public string UserName { get; set; }
        public string Email { get; set; }
        /// <summary>
        /// Gets or sets a value indicating whether to show the news item on home page
        /// </summary>
        public bool ShowOnHomePage { get; set; }
        public bool ShowPictureDetail { get; set; }
        public bool HasProductTag { get; set; }
        public string ProductTags { get; set; }
        public bool Published { get; set; }
        public int DisplayOrder { get; set; }
        public int TemplateId { get; set; }
        /// <summary>
        /// Gets or sets the news item start date and time
        /// </summary>
        public DateTime? StartDateUtc { get; set; }
        /// <summary>
        /// Gets or sets the news item end date and time
        /// </summary>
        public DateTime? EndDateUtc { get; set; }
        /// <summary>
        /// Gets or sets the date and time of entity creation
        /// </summary>
        public DateTime CreatedOn { get; set; }
        /// <summary>
        /// Gets or sets the date and time of news update
        /// </summary>
        public DateTime UpdatedOn { get; set; }        
        /// <summary>
        /// Gets or sets a value indicating whether the entity has been deleted
        /// </summary>
        public bool Deleted { get; set; }

        /// <summary>
        /// Gets or sets the news comments
        /// </summary>
        public virtual ICollection<NewsItemComment> NewsComments
        {
            get => _newsComments ?? (_newsComments = new List<NewsItemComment>());
            protected set =>  _newsComments = value;
        }


        /// <summary>
        /// Gets or sets the collection of NewsCategory
        /// </summary>
        public virtual ICollection<NewsCategoryMapping> NewsCategoriesMapping
        {
            get => _newsCategories ?? (_newsCategories = new List<NewsCategoryMapping>());
            set => _newsCategories = value;
        }
        public virtual NewsItemTemplate Template { get; set; }
    }
}

2.NewsCategoryMapping
namespace Nop.Plugin.Misc.GetNewsItem.Manager.Domain
{
    public partial class NewsCategoryMapping : BaseEntity
    {
        public int NewsItemId { get; set; }
        public int CategoryId { get; set; }
        public int DisplayOrder { get; set; }
        public virtual MiscNewsCategory NewsCategory { get; set; }
        public virtual MiscNewsItem NewsItem { get; set; }        
    }
}

3.NewsCategoryMappingMap
namespace Nop.Plugin.Misc.GetNewsItem.Manager.Data
{
    public partial class NewsCategoryMappingMap : NopEntityTypeConfiguration<NewsCategoryMapping>
    {
        public override void Configure(EntityTypeBuilder<NewsCategoryMapping> builder)
        {
            builder.ToTable(nameof(NewsCategoryMapping));
            builder.HasKey(record => record.Id);

            //NewsCategory
            builder.HasOne(nc => nc.NewsCategory)
                .WithMany()
                .HasForeignKey(nc => nc.CategoryId).IsRequired();

            //NewsItem
            builder.HasOne(ni => ni.NewsItem)
                .WithMany(nc => nc.NewsCategoriesMapping)
                .HasForeignKey(ni => ni.NewsItemId).IsRequired();

            //base.Configure(builder);
        }
    }
}

4.MiscNewsItemMap
namespace Nop.Plugin.Misc.GetNewsItem.Manager.Data
{
    public partial class MiscNewsItemMap : NopEntityTypeConfiguration<MiscNewsItem>
    {
        public override void Configure(EntityTypeBuilder<MiscNewsItem> builder)
        {
            builder.ToTable(nameof(MiscNewsItem));
            builder.HasKey(record => record.Id);            
            builder.Property(ni => ni.MetaKeywords).HasMaxLength(400);
            builder.Property(ni => ni.MetaTitle).HasMaxLength(400);
            

            builder.HasOne(nc => nc.Template)
               .WithMany(n => n.NewsItems)
               .HasForeignKey(nc => nc.TemplateId);
        

            //base.Configure(builder);          
        }
    }
}

Please help me!!!

private ICollection<NewsCategoryMapping> _newsCategories;

====>
private ICollection<NewsCategoryMapping> _newsCategoryMapping;
-----------------------------------------------------------------------------


public virtual ICollection<NewsCategoryMapping> NewsCategoriesMapping
{
    get => _newsCategories ?? (_newsCategories = new List<NewsCategoryMapping>());
    set => _newsCategories = value;
}

===>
public virtual ICollection<NewsCategoryMapping> NewsCategoriesMapping
{
    get => _newsCategoryMapping ?? (_newsCategoryMapping= new List<NewsCategoryMapping>());
    set => _newsCategoryMapping= value;
}