Flask-Breadcrumbs Not working

Hello,

I have implement Flask-Breadcrumbs menu in my flask app. but it will give me key error like "**KeyError: 'menu'**"

I will show you some code:
Py File

from flask_breadcrumbs import Breadcrumbs, register_breadcrumb,default_breadcrumb_root
Breadcrumbs(app=app)
default_breadcrumb_root(user_blueprint,'.')

@user_blueprint.route('/user/register')
@register_breadcrumb(user_blueprint, '.user.register', 'Home')
def register():
error = None
return render_template('register.html',error=error)

register.html File


Start by reproducing the reported KeyError: 'menu' with the shown Breadcrumbs(app=app), default_breadcrumb_root, register_breadcrumb, and register.html template setup. Inspect the Flask-Breadcrumbs entry points involved in breadcrumb registration and template rendering. Done means the example renders its breadcrumbs without the KeyError and the behavior is covered by a regression test.

Written by the indexing model from the issue text.