Why isn't my register form appearing on the page?

[DanCDN]

I have made my forms for the clients including login, forgot password, and guest login, however when I am trying to show my register form it doesn't appear. 

In my register form, I added an first name, last name, email and password input but they do not appear.

And from the login page, I attached an <a> tag to bring the customers to create an account like this: 

<a href="{{ routes.account_register_url }}">Create account</a>

But when the customers click the button the page is blank, like this: 

I don't know what error may I have.