引入FOREIGN KEY约束可能会导致循环或多个级联路径

我的MVC项目中有以下内容（代码优先方法），我想知道出现以下错误的原因是什么

在表“ VendorDetails”上引入FOREIGN KEY约束“ FK_dbo.VendorDetails_dbo.States_StateID”可能会导致循环或多个级联路径。指定ON DELETE NO ACTION或ON UPDATE NO ACTION，或修改其他FOREIGN KEY约束。无法创建约束。请参阅先前的错误。

我只是想知道哪些表正在获取多个级联路径，任何图都将有效，并且我应该使用流畅的API编写如下代码： modelBuilder.Entity<...>() .HasRequired(...) .WithMany(...) .HasForeignKey(...) .WillCascadeOnDelete(false);

public class VendorDetails
{
    [Key]
    [DatabaseGenerated(DatabaseGeneratedOption.Identity)]
    public int VendorID { get; set; }        
    [MaxLength(60)]
    public string VendorName { get; set; }        

    public int VendorTypeID { get; set; }
    public int CountryID { get; set; }
    public int StateID { get; set; }        

    [NotMapped]
    public string CountryName { get; set; }
    [NotMapped]
    public string StateName { get; set; }
    [NotMapped]
    public string VendorTypeName { get; set; }

    public virtual Country Country { get; set; }
    public virtual State State { get; set; }
    public virtual VendorType VendorType { get; set; }
}

public class VendorType
{
    [Key]
    [DatabaseGenerated(DatabaseGeneratedOption.Identity)]
    public int VendorTypeID { get; set; }                

    public string VendorTypeName { get; set; }

    public virtual ICollection<VendorDetails> Vendors { get; set; }
 }


public class Country
{
    [Key]
    [DatabaseGenerated(DatabaseGeneratedOption.Identity)]
    public int CountryID { get; set; }
    public string CountryName { get; set; }

    public virtual ICollection<State> States { get; set; }
}

public class State
{
    [Key]
    [DatabaseGenerated(DatabaseGeneratedOption.Identity)]
    public int StateID { get; set; }
    public string StateName { get; set; }

    public int CountryID { get; set; }
    public virtual Country Country { get; set; }
}