methods

var (
	ErrSigned                      = errors.New("the account has been signed today")
	ErrNoSuchAccount               = errors.New("no such account")
	ErrInsufficientCookie          = errors.New("insufficient cookie")
	ErrWrongAccountEmailOrPassword = errors.New("wrong account email or password")
	ErrInvalidCookie               = errors.New("invalid cookie")
	ErrLoginFailed                 = errors.New("login failed")
	ErrUnknown                     = errors.New("unknown error")
)