python - Flask werkzeug.routing.BuildError -


i doing flask app , when try put link redirect user profile page calling

builderror: not build url endpoint 'profile'. did forget specify values ['business_name']?

when try login user.my app works fine previous days same code not has happen , have tried possible means right no way 

@app.route('/profile/<business_name>') @login_required def profile(business_name):     user = user.query.filter_by(business_name=business_name).first()     if user == none:         flash('this profile not exist {}'.format(business_name))         return redirect(url_for('login'))      return render_template('profile.html',user=user)

(main.html)

<ul class="nav navbar-nav">     <li><a href="{{ url_for('home_page') }}" class="active">home</a></li>     {% if g.user.is_authenticated %}     <li><a href="{{ url_for('profile', business_name=g.user.business_name) }}">your profile</a></li>     <li><a href="{{url_for('logout')}}">logout</a></li>

problem not defining route view function take in following form:

/profile/business_name

hence should send business_name in url sending arguments function. should following:

<a href="/profile/{{business_name=g.user.business_name }}">

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