simplemember - object 'Users'已经存在

我正在用Asp.net MVC开发SPA。项目工作在本地主机很好，但我有一个问题的主机。

有一个控制器可以与包含少量方法的MembershipProvider一起工作。

[InitializeSimpleMembership]
public class AccountController : ApiController
{
    public object Get()
    {
        ...
    }
    ...
}

关键时刻-是属性InitializeSimpleMembership。声明:

[AttributeUsage(AttributeTargets.Class | AttributeTargets.Method, AllowMultiple = false, Inherited = true)]
public sealed class InitializeSimpleMembershipAttribute : ActionFilterAttribute
{
    private static SimpleMembershipInitializer _initializer;
    private static object _initializerLock = new object();
    private static bool _isInitialized;
    public override void OnActionExecuting(System.Web.Http.Controllers.HttpActionContext actionContext)
    {
        // Ensure ASP.NET Simple Membership is initialized only once per app start
        LazyInitializer.EnsureInitialized(ref _initializer, ref _isInitialized, ref _initializerLock);
    }
    private class SimpleMembershipInitializer
    {
        public SimpleMembershipInitializer()
        {
            Database.SetInitializer(new ITAInitializer());
            using (var context = new ITAContext())
            {
                if (!context.Database.Exists())
                {
                    ((IObjectContextAdapter)context).ObjectContext.CreateDatabase();
                }
            }
            WebSecurity.InitializeDatabaseConnection("ITAContext", "Users", "ID", "Login", autoCreateTables: true);
            if (!Roles.RoleExists(UserRights.Admin.ToString()))
                Roles.CreateRole(UserRights.Admin.ToString());
            if (!Roles.RoleExists(UserRights.Moderator.ToString()))
                Roles.CreateRole(UserRights.Moderator.ToString());
            if (!Roles.RoleExists(UserRights.User.ToString()))
                Roles.CreateRole(UserRights.User.ToString());
        }
    }
}

当我在控制器中调用任何方法时，我得到一个错误:

数据库中已经存在一个名为"Users"的对象。

如果我要删除表Users，那么首先请求运行良好并创建表。在下一个呼叫中，我再次得到一个错误。为什么它试图创建表，而不是使用现有的?