EF Core Relation doesn't exist

I want to create a database in PostgreSQL and API for my app. I've created Model and API in EF Core 1.0.0. Model exists in separate library.

public class Architect : IEntity{public Guid Id { get; set; }public string FirstName { get; set; }public string LastName { get; set; }public string PhoneNumber { get; set; }public string Email { get; set; }public ICollection<Project> Projects { get; set; }}public class Project : IEntity{public Guid Id { get; set; }public string Name { get; set; }[JsonConverter(typeof(IsoDateTimeConverter))]public DateTimeOffset CreatedAt { get; set; }public ICollection<Company> Companies { get; set; }public string City { get; set; }public ICollection<ProjectState> ProjectStates { get; set; }public Guid ArchitectId { get; set; }public Architect Architect { get; set; }}public class Company : IEntity{public Guid Id { get; set; }public string Name { get; set; }public Guid ProjectId { get; set; }public Project Project { get; set; }}public class ProjectState : IEntity{public Guid Id { get; set; }public ProjectPhase phase { get; set; }public DateTime StartDate { get; set; }public DateTime EndDate { get; set; }public Guid ProjectId { get; set; }public Project Project { get; set; }}

I have created also DemoContext that inherits DbContext. I defined relashionships in OnModelCreating(ModelBuilder modelBuilder) method.

public class DemoContext : DbContext{public DbSet<Architect> Architects { get; set; }public DbSet<Project> Projects { get; set; }public DbSet<Company> Companies { get; set; }public DbSet<ProjectState> ProjectStates { get; set; }public DemoContext(DbContextOptions<DemoContext> options) : base(options) { }protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder){optionsBuilder.UseNpgsql("PORT = 5432; HOST = localhost; TIMEOUT = 15; POOLING = True; MINPOOLSIZE = 1; MAXPOOLSIZE = 20; COMMANDTIMEOUT = 20; DATABASE = ProgressTest; PASSWORD = 'postgres'; USER ID = postgres", b => b.MigrationsAssembly("WebAPI.API"));}protected override void OnModelCreating(ModelBuilder modelBuilder){modelBuilder.HasPostgresExtension("uuid-ossp");modelBuilder.Entity<Project>().HasOne(p => p.Architect).WithMany(a => a.Projects).HasForeignKey(p=>p.ArchitectId);modelBuilder.Entity<ProjectState>().HasOne(p => p.Project).WithMany(p => p.ProjectStates).HasForeignKey(p => p.ProjectId);modelBuilder.Entity<Company>().HasOne(c => c.Project).WithMany(p => p.Companies).HasForeignKey(c => c.ProjectId);}}

I want to migrate all classes and create new database. I've useddotnet ef migrations add InitializeMigration to add new migration and after it I wanted to update my database, so I've used dotnet ef database update but Postgres throw an Exception:

Npgsql.PostgresException: 42P01: relationship "ProjectState.IX_ProjectState_ProjectId" doesn't exist

Can you help me with it?