为什么告诉我TemplateNotFound: bootstrap/wtf.html？

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对着书上敲的代码

{% extends "base.html" %} 
{% import "bootstrap/wtf.html" as wtf %} 
{% block title %}index{% endblock %} 
{% block body %} 
<div class='page-header'> 
<h1>hello,{% if name %}{{name}}{% else %}Stranger{% endif %}!</h1> 
</div> 
{{wtf.quick_form(form)}} 
{% endblock %} 

参考：

from flask import Flask 
from flask_bootstrap import Bootstrap 
app = Flask(__name__) 
bootstrap = Bootstrap(app)