EntityType“Account”没有定义键。定义此EntityType的键

我有两个实体类:

namespace PowerSupply.Domain
{
    [Table("Accounts")]
    public class Account
    {
        public int Id;
        public string CompanyName;
        public float Interval;
    }
}

以及

namespace PowerSupply.Domain
{
   public class ContactInfo
    {
        public int Id { get; set; }
        public string mobileNo { get; set; }
        public virtual Account Account { get; set; }
    }
}

以及我的背景:

public class PowerSupplyDBContext : DbContext
{
    public PowerSupplyDBContext() : base("PowerSupplyDatabase")
    {

    }

    public DbSet<Account> Acounts { get; set; }
    public DbSet<ContactInfo> ContactInfo { get; set; }
}

One or more validation errors were detected during model generation:

PowerSupply.Persistance.Facade.Account: : EntityType 'Account' has no key defined. Define the key for this EntityType.
Acounts: EntityType: EntitySet 'Acounts' is based on type 'Account' that has no keys defined.

我学习和阅读 this 重复。