org.thymeleaf.exceptions.TemplateInputException:の対処方法

「Spring解体新書」というテキストを参考にSpringの勉強をしているのですが、このエラーが出てしまい手も足も出ない状態です。

エラー

org.thymeleaf.exceptions.TemplateInputException: An error happened during template parsing (template: "class path resource [templates/login/homeLayout.html]")
	at org.thymeleaf.templateparser.markup.AbstractMarkupTemplateParser.parse(AbstractMarkupTemplateParser.java:241) ~[thymeleaf-3.0.11.RELEASE.jar:3.0.11.RELEASE]

(文字数制限のため一部省略)

Caused by: org.attoparser.ParseException: Error during execution of processor 'org.thymeleaf.standard.processor.StandardIncludeTagProcessor' (template: "login/homeLayout" - line 48, col 22)
	at org.attoparser.MarkupParser.parseDocument(MarkupParser.java:393) ~[attoparser-2.0.5.RELEASE.jar:2.0.5.RELEASE]
	at org.attoparser.MarkupParser.parse(MarkupParser.java:257) ~[attoparser-2.0.5.RELEASE.jar:2.0.5.RELEASE]
	at org.thymeleaf.templateparser.markup.AbstractMarkupTemplateParser.parse(AbstractMarkupTemplateParser.java:230) ~[thymeleaf-3.0.11.RELEASE.jar:3.0.11.RELEASE]
	... 48 common frames omitted

homeLayoutの48行目でエラーが起こっているのは分かるのですが、ここからどのように対処すれば良いのか分かりません。

HomeController.java

import java.util.List;
import java.util.Map;
import java.util.LinkedHashMap;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.PostMapping;

import com.example.demo.login.domain.model.SignupForm;
import com.example.demo.login.domain.model.User;
import com.example.demo.login.domain.service.UserService;

@Controller
public class HomeController {
	@Autowired
	UserService userService;
	
	//結婚ステータスのラジオボタン用変数
	private Map<String, String> radioMarriage;
	
	//ラジオボタンの初期化メソッド(ユーザー登録画面と同じ)
	private Map<String, String> initRadioMarriage(){
		Map<String, String> radio = new LinkedHashMap<>();
		
		//既婚、未婚をMapに格納
		radio.put("既婚", "true");
		radio.put("未婚", "false");
		
		return radio;
	}
	
	@GetMapping("/home")
	public String getHome(Model model) {
		model.addAttribute("contents", "login/home :: home_contents");
		return "login/homeLayout";
	}
	
	//ユーザー一覧画面のGET用メソッド
	@GetMapping("/userList")
	public String getUserList(Model model) {
		model.addAttribute("contents", "login/userList :: userList_contents");
		List<User> userList = userService.selectMany();
		model.addAttribute("userList", userList);
		
		int count = userService.count();
		model.addAttribute("userListCount", count);
		
		return "login/homeLayout";
	}
	
	@GetMapping("/userDetail/{id:.+}")
	public String getUserDetail(@ModelAttribute SignupForm form, Model model, @PathVariable("id") String userId) {
		System.out.println("userId = " + userId);
		model.addAttribute("contents", "login/userDetail :: userDetail contents");
		radioMarriage = initRadioMarriage();
		model.addAttribute("radioMarriage", radioMarriage);
		if(userId != null && userId.length() > 0) {
			User user = userService.selectOne(userId);
			
			form.setUserId(user.getUserId());
			form.setUserName(user.getUserName());
			form.setBirthday(user.getBirthday());
			form.setAge(user.getAge());
			form.setMarriage(user.isMarriage());
			
			model.addAttribute("signupForm", form);
		}
		
		return "login/homeLayout";
	}
	
	@PostMapping("/logout")
	public String postLogout() {
		return "redirect:/login";
	}
	
	@GetMapping("/userList/csv")
	public String getUserListCsv(Model model) {
		return getUserList(model);
	}
}

homeLayout.html

HTML
1<!DOCTYPE html>
2<html xmlns:th="http://www.thymeleaf.org"
3      xmlns:layout="http://www.ultraq.net.nz/thymeleaf/layout">
4
5<head>
6    <meta charset="UTF-8"></meta>
7
8    <!-- Bootstrapの設定 -->
9    <link th:href="@{/webjars/bootstrap/3.3.7-1/css/bootstrap.min.css}" rel="stylesheet"></link>
10    <script th:src="@{/webjars/jquery/1.11.1/jquery.min.js}"></script>
11    <script th:src="@{/webjars/bootstrap/3.3.7-1/js/bootstrap.min.js}"></script>
12
13    <!-- CSSの読込 -->
14    <link th:href="@{/css/home.css}" rel="stylesheet"></link>
15
16    <title>Home</title>
17</head>
18<body>
19    <!-- ===== ヘッダー（ナビゲーションバー） =====  -->
20    <nav class="navbar navbar-inverse navbar-fixed-top">
21        <div class="container-fluid">
22            <div class="navbar-header">
23                <a class="navbar-brand" href="#">SpringSample</a>
24            </div>
25            <form method="post" th:action="@{/logout}">
26                <button class="btn btn-link pull-right navbar-brand" type="submit">
27                    ログアウト
28                </button>
29            </form>
30        </div>
31    </nav>
32    <!-- ===== サイドバー ===== -->
33    <div class="container-fluid">
34        <div class="row">
35            <div class="col-sm-2 sidebar">
36                <ul class="nav nav-pills nav-stacked">
37                    <li role="presentation">
38                        <a th:href="@{'/userList'}">ユーザ管理</a>
39                    </li>
40                </ul>
41            </div>
42        </div>
43    </div>
44    <!-- ===== コンテンツ ===== -->
45    <div class="container-fluid">
46        <div class="row">
47            <div class="col-sm-10 col-sm-offset-2 main">
48                <div th:include="__${contents}__"></div>
49            </div>
50        </div>
51    </div>
52</body>
53</html>