Flask　expected token ',', got 'main'エラー

Flaskのアプリを実行すると、どうしてもcategory_maintenance.html内の
<li {% if blog_categories.has_next %}class="page-item"{% else %} class="page-item disabled"{% endif %}><a class="page-link" href="{% if blog_categories.has_next %}{{ url_for('main.category_maintenance', page=blog_categories.next_num) }}{% else %}#{% endif %}">次へ</a></li> </ul>でエラーとなってしまいます。

エラー内容

jinja2.exceptions.TemplateSyntaxError: expected token ',', got 'main'

エラー内容を調べると、()や{}の閉じ忘れの様なことですが、何度見直しても、閉じ忘れは無いように思えます。
どなたかアドバイス、ご教示いただければと思います。

category_maintenance.html

html
1{% extends "base.html" %}
2{% block content %}
3    <header id="page-header">
4        <div class="container my-3 py-3 bg-light">
5            <div class="row">
6                <div class="col-md-6 m-auto text-center">
7                    <h1>カテゴリ管理</h1>
8                </div>
9            </div>
10        </div>
11    </header>
12    <section id="menu">
13        <div class="container my-3 py-3 bg-light">
14            <div class="row">
15                <div class="col-md-3">
16                    <button type="button" class="btn btn-warning w-100" data-bs-toggle="modal" data-bs-target="#addCategoryModal">
17                        カテゴリ追加
18                    </button>
19                </div>
20            </div>
21        </div>
22    </section>
23
24    <section id="list">
25        <div class="container my-3">
26            <div class="row">
27                <div class="col-md-9">
28                    <div class="card">
29                        <div class="card-header">
30                            <h4>最新のカテゴリ</h4>
31                        </div>
32                        <table class="table table-striped">
33                            <thead class="table-dark">
34                                <tr>
35                                    <th>ID</th>
36                                    <th>カテゴリ名</th>
37                                    <th>ブログ投稿数</th>
38                                    <th>変更</th>
39                                </tr>
40                            </thead>
41                            <tbody>
42                                {% for blog_category in blog_categories.items %}
43                                <tr>
44                                    <td>{{ blog_category.id }}</td>
45                                    <td>{{blog_category.category}}</td>
46                                    <td><a href="#">ブログ投稿数</a></td>
47                                    <td><a href="#" class="btn btn-secondary">
48                                        変更
49                                    </a></td>
50                                </tr>
51                                {% endfor %}
52                            </tbody>
53                        </table>
54                    </div>
55                </div>
56            </div>
57        </div>
58    </section>
59
60    <nav class="my-2" aria-label="Page navigation">
61        <ul class="pagination justify-content-center">
62          <li {% if blog_categories.has_prev %}class="page-item"{% else %} class="page-item disabled"{% endif %}><a class="page-link" href="{% if blog_categories.has_prev %}{{ url_for('main.category_maintenance', page=blog_categories.prev_num) }}{% else %}#{% endif %}">前へ</a></li>
63
64    
65          {% for page_num in blog_categories.iter_pages(left_edge=1, right_edge=1, left_current=1, right_current=2) %}  
66            {% if page_num %}
67                {% if blog_categories.page == page_num %}
68                    <li class="page-item disabled"><a class="page-link" href="#">{{ page_num }}</a></li>
69                {% else %}
70                    <li class="page-item"><a class="page-link" href="{{ url_for('main.category_maintenance, page=page_num) }}">{{ page_num }}</a></li>
71                {% endif %}
72            {% else %}
73                <li class="page-item disabled"><a class="page-link" href="#">&hellip;</a></li>
74            {% endif %}
75          {% endfor %}
76
77          <li {% if blog_categories.has_next %}class="page-item"{% else %} class="page-item disabled"{% endif %}><a class="page-link" href="{% if blog_categories.has_next %}{{ url_for('main.category_maintenance', page=blog_categories.next_num) }}{% else %}#{% endif %}">次へ</a></li>
78        </ul>
79      </nav>
80<!-- Modal -->
81<div class="modal fade" id="addCategoryModal" tabindex="-1" aria-labelledby="exampleModalLabel" aria-hidden="true">
82    <div class="modal-dialog modal-lg">
83      <div class="modal-content">
84        <div class="modal-header bg-warning">
85          <h5 class="modal-title" id="exampleModalLabel">カテゴリ追加</h5>
86          <button type="button" class="btn-close" data-bs-dismiss="modal" aria-label="Close"></button>
87        </div>
88        <form method="POST">
89            {{ form.hidden_tag() }}
90            <div class="modal-body">
91            <div class="form-group">
92                {{ form.category.label(class="form-control-label") }}
93                {{ form.category(class="form-control") }}
94            </div>
95            </div>
96            <div class="modal-footer">
97                {{ form.submit(class="btn btn-warning") }}
98            </div>
99        </form>
100      </div>
101    </div>
102  </div>
103{% endblock %}

base.html

html
1<!DOCTYPE html>
2<html lang="en">
3<head>
4    <meta charset="UTF-8">
5    <meta http-equiv="X-UA-Compatible" content="IE=edge">
6    <meta name="viewport" content="width=device-width, initial-scale=1.0">
7    <!-- CSS only -->
8    <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.0.2/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-EVSTQN3/azprG1Anm3QDgpJLIm9Nao0Yz1ztcQTwFspd3yD65VohhpuuCOmLASjC" crossorigin="anonymous">
9    <!-- JavaScript Bundle with Popper -->
10    <script src="https://cdn.jsdelivr.net/npm/bootstrap@5.0.2/dist/js/bootstrap.bundle.min.js" integrity="sha384-MrcW6ZMFYlzcLA8Nl+NtUVF0sA7MsXsP1UyJoMp4YLEuNSfAP+JcXn/tWtIaxVXM" crossorigin="anonymous"></script>    
11    <title>Yossy Inc.</title>
12</head>
13<body>
14  <nav class="navbar navbar-expand-lg navbar-dark bg-dark fixed-top">
15      <div class="container">
16        <a class="navbar-brand" href="#">Sample Inc.</a>
17        <button class="navbar-toggler" type="button" data-bs-toggle="collapse" data-bs-target="#navbarNav" aria-controls="navbarNav" aria-expanded="false" aria-label="Toggle navigation">
18          <span class="navbar-toggler-icon"></span>
19        </button>
20        <div class="collapse navbar-collapse" id="navbarNav">
21          <ul class="navbar-nav">
22            <li class="nav-item">
23              <a class="nav-link" href="#">ホーム</a>
24            </li>
25            <li class="nav-item">
26              <a class="nav-link" href="#">会社情報</a>
27            </li>
28            <li class="nav-item">
29              <a class="nav-link" href="#">お問い合わせ</a>
30            </li>
31          </ul>
32
33          <ul class="navbar-nav ms-auto">
34            <li class="nav-item">
35              <a class="nav-link" href="#">ブログ</a>
36            </li>
37            <li class="nav-item">
38              <a class="nav-link" href="{{ url_for('main.category_maintenance') }}">カテゴリ</a>
39            </li>
40            <li class="nav-item">
41              <a class="nav-link" href="#">お問い合わせ</a>
42            </li>
43            <li class="nav-item">
44              <a class="nav-link" href="{{url_for('users.user_maintenance')}}">ユーザー</a>
45            </li>
46            {% if current_user.is_authenticated %}
47            <li class="nav-item">
48              <a class="nav-link" href="{{ url_for('users.logout') }}">ログアウト</a>
49            </li>
50            <span class="navbar-text ms-3">
51              {{ current_user.username }}
52            </span>
53            {% endif %}
54          </ul>
55        </div>
56      </div>
57    </nav>   
58      {% from "_formhelpers.html" import render_field %}
59
60      <div class="container" style="padding-top: 4rem; padding-bottom: 4rem;">
61        {% for message in get_flashed_messages() %}
62        <div class="alert alert-warning alert-dismissible fade show" role="alert">
63          {{ message }}
64          <button type="button" class="btn-close" data-bs-dismiss="alert" aria-label="Close"></button>
65        </div>
66        {% endfor %}
67
68        {% block content %}
69
70        {% endblock %}
71      </div>
72
73      <footer id="footer" class="footer text-center pt-2 bg-dark fixed-bottom">
74        <div class="container">
75          <div class="row">
76            <div class="col text-white">
77              <p>Copyright @ 2022 Sample Inc.</p>
78            </div>
79          </div>
80        </div>
81      </footer>
82</body>
83</html>

vies.py

python
1from flask import Blueprint, render_template, request, url_for, redirect, flash
2from flask_login import login_required
3from company_blog.models import BlogCategory
4from company_blog.main.forms import BlogCategoryForm
5from company_blog import db
6
7# Blueprintの実装
8main = Blueprint('main', __name__)
9
10@main.route('/category_maintenance', methods=['GET', 'POST'])
11@login_required
12def category_maintenance():
13    page = request.args.get('page', 1, type=int)
14    blog_categories = BlogCategory.query.order_by(BlogCategory.id.asc()).paginate(page=page, per_page=10)
15    form = BlogCategoryForm()
16    # フォームの入力チェック
17    if form.validate_on_submit():
18        # 問題が無い場合、blog_categoryにフォームデータを渡す。
19        blog_category = BlogCategory(category=form.category.data)
20        db.session.add(blog_category)
21        db.session.commit()
22        flash('ブログカテゴリが追加されました')
23        return redirect(url_for('main.category_maintenance'))
24    elif form.errors:
25        # フォームの内容をクリア
26        form.category.data = ""
27        # フィールドカテゴリに設定されたエラーメッセージを表示
28        flash(form.errors['category'][0])
29    return render_template('category_maintenance.html', blog_categories=blog_categories, form=form)