Error when deploying af Model containing associations

public IPrincipal Login(ILoginCredential credential, EntityManager entityManager)

// Disallow null credentials and throw a LoginException

if (credential == null)

throw new LoginException(LoginExceptionType.NoCredentials, "Loginoplysninger mangler");

//return error if loginmanager i null

if (entityManager == null)

throw new LoginException(LoginExceptionType.NoLoginManager, "Loginmanager findes ikke.");

var user = entityManager.GetQuery<User>().FirstOrDefault(u => u.Id == credential.UserName);

//user does not exist

if (user == null)

throw new LoginException(LoginExceptionType.InvalidUserName, "Bruger '" + credential.UserName + "' findes ikke.");

//wrong password

if (user.Password != credential.Password)

throw new LoginException(LoginExceptionType.InvalidPassword, "Forkert password.");

// types implementing IPrincipal.

GenericIdentity identity = new GenericIdentity(credential.UserName);

GenericPrincipal principal = new GenericPrincipal(identity, new string[] { });

return principal;

public void Logout(IPrincipal principal, EntityManager entityManager)

// No special processing needed.