Metadata :: null argument in ReferenceBuilder

[maumar]

Model:

public class IdentityUser
{
    public string Id { get; set; }
}

public class ApplicationUser : IdentityUser
{
    public List<FollowUser> Followers { get; set; }
    public List<Content> Content { get; set; }
}

public class User : ApplicationUser
{
    public List<Character> Characters { get; set; }
    public List<FollowUser> Following { get; set; }
}

public class Character : ApplicationUser
{
    [Column(TypeName = "nvarchar(450)")]
    public string OwnerId { get; set; }
     public User Owner { get; set; }
}

public class FollowUser
{
    public int Id { get; set; }

    [Column(TypeName = "nvarchar(450)")]
    public string UserId { get; set; }
    public User User { get; set; }

    [Column(TypeName = "nvarchar(450)")]
    public string FollowingId { get; set; }
    public ApplicationUser Following { get; set; }
}

public class Content
{
    public Guid Id { get; set; }
    public string ContentType { get; set; }
    public DateTime Timestamp { get; set; }

    public List<Content> Comments { get; set; }

    public Guid? CommentOfId { get; set; }
    public Content CommentOf { get; set; }

    [Column(TypeName = "nvarchar(450)")]
    public string OwnerId { get; set; }
    public ApplicationUser Owner { get; set; }
}

public class ApplicationDbContext : DbContext
    {

        public DbSet<ApplicationUser> Users { get; set;}
        public DbSet<FollowUser> FollowUser { get; set; }
        public DbSet<Content> Content { get; set; }

        protected override void OnModelCreating(ModelBuilder builder)
        {
            base.OnModelCreating(builder);

            builder.Entity<ApplicationUser>()
                .HasDiscriminator<string>("AccountType")
                .HasValue<User>("User")
                .HasValue<Character>("Character");

            builder.Entity<User>()
                .HasMany(x => x.Characters)
                .WithOne(x => x.Owner)
                .HasForeignKey(x => x.OwnerId)
                .HasPrincipalKey(x => x.Id);

            builder.Entity<FollowUser>()
                .HasOne(x => x.User)
                .WithMany(x => x.Following)
                .OnDelete(DeleteBehavior.Cascade);

            builder.Entity<Content>()
                .HasOne(x => x.Owner)
                .WithMany(x => x.Content)
                .HasForeignKey(x => x.OwnerId);

            builder.Entity<Content>()
                .HasMany(x => x.Comments)
                .WithOne(x => x.CommentOf)
                .OnDelete(DeleteBehavior.Restrict);
        }
    }

Exception:

Value cannot be null.
Parameter name: relationshipBuilder

at Microsoft.EntityFrameworkCore.Utilities.Check.NotNull[T](T value, String parameterName) in D:\k\EntityFramework\src\Shared\Check.cs:line 24
at Microsoft.EntityFrameworkCore.Metadata.Conventions.Internal.ConventionDispatcher.OnForeignKeyAdded(InternalRelationshipBuilder relationshipBuilder) in D:\k\EntityFramework\src\Microsoft.EntityFrameworkCore\Metadata\Conventions\Internal\ConventionDispatcher.cs:line 74
at Microsoft.EntityFrameworkCore.Metadata.Internal.InternalRelationshipBuilder.ReplaceForeignKey(InternalEntityTypeBuilder principalEntityTypeBuilder, InternalEntityTypeBuilder dependentEntityTypeBuilder, String navigationToPrincipalName, String navigationToDependentName, IReadOnlyList1 dependentProperties, IReadOnlyList1 principalProperties, Nullable1 isUnique, Nullable1 isRequired, Nullable1 deleteBehavior, Boolean oldRelationshipInverted, Nullable1 principalEndConfigurationSource, Nullable1 configurationSource, Boolean runConventions) in D:\k\EntityFramework\src\Microsoft.EntityFrameworkCore\Metadata\Internal\InternalRelationshipBuilder.cs:line 1406 at Microsoft.EntityFrameworkCore.Metadata.Internal.InternalRelationshipBuilder.ReplaceForeignKey(Nullable1 configurationSource, InternalEntityTypeBuilder principalEntityTypeBuilder, InternalEntityTypeBuilder dependentEntityTypeBuilder, String navigationToPrincipalName, String navigationToDependentName, IReadOnlyList1 dependentProperties, IReadOnlyList1 principalProperties, Nullable1 isUnique, Nullable1 isRequired, Nullable1 deleteBehavior, Boolean strictPrincipal, Boolean oldRelationshipInverted, Boolean runConventions) in D:\k\EntityFramework\src\Microsoft.EntityFrameworkCore\Metadata\Internal\InternalRelationshipBuilder.cs:line 1060 at Microsoft.EntityFrameworkCore.Metadata.Internal.InternalRelationshipBuilder.Navigations(String navigationToPrincipalName, String navigationToDependentName, ConfigurationSource configurationSource) in D:\k\EntityFramework\src\Microsoft.EntityFrameworkCore\Metadata\Internal\InternalRelationshipBuilder.cs:line 65 at Microsoft.EntityFrameworkCore.Metadata.Internal.InternalEntityTypeBuilder.Relationship(InternalEntityTypeBuilder principalEntityTypeBuilder, String navigationToPrincipalName, String navigationToDependentName, ConfigurationSource configurationSource, Boolean setPrincipalEnd, Nullable1 isUnique) in D:\k\EntityFramework\src\Microsoft.EntityFrameworkCore\Metadata\Internal\InternalEntityTypeBuilder.cs:line 1229
at Microsoft.EntityFrameworkCore.Metadata.Internal.InternalEntityTypeBuilder.Relationship(InternalEntityTypeBuilder targetEntityTypeBuilder, PropertyInfo navigationToTarget, PropertyInfo inverseNavigation, ConfigurationSource configurationSource) in D:\k\EntityFramework\src\Microsoft.EntityFrameworkCore\Metadata\Internal\InternalEntityTypeBuilder.cs:line 1102
at Microsoft.EntityFrameworkCore.Metadata.Internal.InternalEntityTypeBuilder.Relationship(InternalEntityTypeBuilder targetEntityTypeBuilder, PropertyInfo navigationToTarget, PropertyInfo inverseNavigation, ConfigurationSource configurationSource) in D:\k\EntityFramework\src\Microsoft.EntityFrameworkCore\Metadata\Internal\InternalEntityTypeBuilder.cs:line 1081
at Microsoft.EntityFrameworkCore.Metadata.Conventions.Internal.RelationshipDiscoveryConvention.CreateRelationships(IReadOnlyList1 relationshipCandidates, InternalEntityTypeBuilder entityTypeBuilder) in D:\k\EntityFramework\src\Microsoft.EntityFrameworkCore\Metadata\Conventions\Internal\RelationshipDiscoveryConvention.cs:line 285 at Microsoft.EntityFrameworkCore.Metadata.Conventions.Internal.RelationshipDiscoveryConvention.Apply(InternalEntityTypeBuilder entityTypeBuilder) in D:\k\EntityFramework\src\Microsoft.EntityFrameworkCore\Metadata\Conventions\Internal\RelationshipDiscoveryConvention.cs:line 28 at Microsoft.EntityFrameworkCore.Metadata.Conventions.Internal.RelationshipDiscoveryConvention.Apply(InternalRelationshipBuilder relationshipBuilder, Navigation navigation) in D:\k\EntityFramework\src\Microsoft.EntityFrameworkCore\Metadata\Conventions\Internal...crosoft.Extensions.DependencyInjection.ServiceProvider.ScopedCallSite.Invoke(ServiceProvider provider) at Microsoft.Extensions.DependencyInjection.ServiceProvider.<>c__DisplayClass12_0.<RealizeService>b__0(ServiceProvider provider) at Microsoft.Extensions.DependencyInjection.ServiceProvider.GetService(Type serviceType) at Microsoft.Extensions.DependencyInjection.ServiceProviderExtensions.GetRequiredService(IServiceProvider provider, Type serviceType) at Microsoft.Extensions.DependencyInjection.ServiceProviderExtensions.GetRequiredService[T](IServiceProvider provider) at Microsoft.EntityFrameworkCore.Storage.DatabaseProviderServices.GetService[TService]() in D:\k\EntityFramework\src\Microsoft.EntityFrameworkCore\Storage\DatabaseProviderServices.cs:line 57 at Microsoft.EntityFrameworkCore.Storage.Internal.SqlServerDatabaseProviderServices.get_Creator() in D:\k\EntityFramework\src\Microsoft.EntityFrameworkCore.SqlServer\Storage\Internal\SqlServerDatabaseProviderServices.cs:line 36 at Microsoft.Extensions.DependencyInjection.EntityFrameworkServiceCollectionExtensions.<>c.<AddEntityFramework>b__0_11(IServiceProvider p) in D:\k\EntityFramework\src\Microsoft.EntityFrameworkCore\EntityFrameworkServiceCollectionExtensions.cs:line 117 at Microsoft.Extensions.DependencyInjection.ServiceLookup.FactoryService.Invoke(ServiceProvider provider) at Microsoft.Extensions.DependencyInjection.ServiceProvider.ScopedCallSite.Invoke(ServiceProvider provider) at Microsoft.Extensions.DependencyInjection.ServiceProvider.<>c__DisplayClass12_0.<RealizeService>b__0(ServiceProvider provider) at Microsoft.Extensions.DependencyInjection.ServiceProvider.GetService(Type serviceType) at Microsoft.Extensions.DependencyInjection.ServiceProviderExtensions.GetRequiredService(IServiceProvider provider, Type serviceType) at Microsoft.Extensions.DependencyInjection.ServiceProviderExtensions.GetRequiredService[T](IServiceProvider provider) at Microsoft.EntityFrameworkCore.Infrastructure.AccessorExtensions.GetService[TService](IInfrastructure1 accessor) in D:\k\EntityFramework\src\Microsoft.EntityFrameworkCore\Infrastructure\AccessorExtensions.cs:line 44
at Microsoft.EntityFrameworkCore.Infrastructure.DatabaseFacade.EnsureCreated() in D:\k\EntityFramework\src\Microsoft.EntityFrameworkCore\Infrastructure\DatabaseFacade.cs:line 41
at Microsoft.EntityFrameworkCore.SqlServer.FunctionalTests.QueryBugsTest.<>c__DisplayClass43_01.<CreateTestStore>b__0() in D:\k\EntityFramework\test\Microsoft.EntityFrameworkCore.SqlServer.FunctionalTests\QueryBugsTest.cs:line 796 at Microsoft.EntityFrameworkCore.FunctionalTests.TestStore.CreateShared(String name, Action initializeDatabase) in D:\k\EntityFramework\test\Microsoft.EntityFrameworkCore.FunctionalTests\TestStore.cs:line 29 at Microsoft.EntityFrameworkCore.SqlServer.FunctionalTests.Utilities.SqlServerTestStore.CreateShared(Action initializeDatabase) in D:\k\EntityFramework\test\Microsoft.EntityFrameworkCore.SqlServer.FunctionalTests\Utilities\SqlServerTestStore.cs:line 63 at Microsoft.EntityFrameworkCore.SqlServer.FunctionalTests.Utilities.SqlServerTestStore.GetOrCreateShared(String name, Action initializeDatabase) in D:\k\EntityFramework\test\Microsoft.EntityFrameworkCore.SqlServer.FunctionalTests\Utilities\SqlServerTestStore.cs:line 22 at Microsoft.EntityFrameworkCore.SqlServer.FunctionalTests.QueryBugsTest.CreateTestStore[TContext](String databaseName, IServiceProvider serviceProvider, Func3 contextCreator, Action`1 contextInitializer) in D:\k\EntityFramework\test\Microsoft.EntityFrameworkCore.SqlServer.FunctionalTests\QueryBugsTest.cs:line 789
at Microsoft.EntityFrameworkCore.SqlServer.FunctionalTests.QueryBugsTest.CreateDatabase3180() in D:\k\EntityFramework\test\Microsoft.EntityFrameworkCore.SqlServer.FunctionalTests\QueryBugsTest.cs:line 653
at Microsoft.EntityFrameworkCore.SqlServer.FunctionalTests.QueryBugsTest.Repro3180() in D:\k\EntityFramework\test\Microsoft.EntityFrameworkCore.SqlServer.FunctionalTests\QueryBugsTest.cs:line 625

[maumar]

@smitpatel