系统无法找到在虚拟主机托管期间指定的文件

Question

我正在使用asp.net身份和EF数据第一种方法。我在appharbor上托管了我的网站。除AccountController之外，我的所有控制器操作和webapi都正常工作。当用户尝试注册时，会给出Internal server error。错误的细节是：

我的AccountController是：

[Authorize]
    public class AccountController : Controller
    {
        private Entities db = new Entities();
        public AccountController()
            : this(new UserManager<ApplicationUser>(new UserStore<ApplicationUser>(new ApplicationDbContext())))
        {
        }
        [HttpPost]
        [AllowAnonymous]
        public async Task<JsonResult> RegisterUser(string email, string password = "aa")
        {

            var roleManager = new RoleManager<Microsoft.AspNet.Identity.EntityFramework.IdentityRole>(new RoleStore<IdentityRole>(new ApplicationDbContext()));


            if (!roleManager.RoleExists("Admin"))
            {
                var role = new Microsoft.AspNet.Identity.EntityFramework.IdentityRole();
                role.Name = "Admin";
                roleManager.Create(role);

            }


            var ab = email.Split('@');

            var user = new ApplicationUser() { UserName = email };
            user.Email = ab[0];
            UserManager.PasswordValidator = new PasswordValidator
            {
                RequiredLength = -1
            };
            var result = await UserManager.CreateAsync(user, password);
            if (result.Succeeded)
            {
                var currentUser = UserManager.FindByName(user.UserName);

                var roleresult = UserManager.AddToRole(currentUser.Id, "Admin");

                try { 
                await SignInAsync(user, isPersistent: true);
                }
                catch (Exception e)
                {
                    string s = e.ToString();
                }
                var id = user.Id;
                var data =await db.AspNetUsers.FindAsync(id);
                if (password == "aa")
                {
                    data.IsPasswordSaved = false;
                }
                else
                {
                    data.IsPasswordSaved = true;
                }
                db.Entry(data).State = System.Data.Entity.EntityState.Modified;
                await db.SaveChangesAsync();
                return Json("Done", JsonRequestBehavior.AllowGet);
            }
            return Json("Error", JsonRequestBehavior.AllowGet);
        }
    }

我尝试从this回答启用远程连接。但在SQL Server Configuration Manager中，SQL Server Network Configuration没有选项Protocols for SQLEXPRESS。我该如何解决这个问题？