title: render_template() takes exactly 1 argument
body: <p>I I am getting a 500 error when I click submit for the following view.  Why am I getting this error and how do I fix it?</p>
  
  <pre><code>from flask import Flask, render_template
  from flask import request, jsonify
  
  app = Flask(__name__)
  
  @app.route('/', methods=['GET', 'POST'])
  def homepage():
      if request.method == 'POST':
          f1 = request.form['firstVerb']
          f2 = request.form['secondVerb']
          return render_template('index.html', f1, f2)
      return render_template('index.html')
  
  if __name__ == "__main__":
      app.run();
  </code></pre>
  
  <pre class="lang-html prettyprint-override"><code>&lt;form class="form-inline" method="post" action=""&gt;
  &lt;div class="form-group"&gt;
      &lt;label for="first"&gt;First word&lt;/label&gt;
      &lt;input type="text" class="form-control" id="first" name="firstVerb"&gt;
  &lt;/div&gt;
  &lt;div class="form-group"&gt;
      &lt;label for="second"&gt;Second Word&lt;/label&gt;
      &lt;input type="text" class="form-control" id="second" name="secondVerb" &gt;
  &lt;/div&gt;
  &lt;button type="submit" class="btn btn-primary"&gt;Run it&lt;/button&gt;
  &lt;/form&gt;
  
  {{ f1 }}
  {{ f2 }}
  </code></pre>