Java → Kotlin

android studioで開発中のアプリをConvert Java File to Kotlin Fileで変換したところうまく動かなくなりました。
エラーが発生しているのはRetrofitで使うデータクラスの部分です。
Parcelableはプラグインを使って作成しました。

Java
1public class Word implements Parcelable {
2//一部抜粋
3	@Expose
4	private Integer id;
5	@Expose
6	private String keyword;
7	@Expose
8	private Integer type;
9	@Expose
10	private Integer level;
11	@Expose
12	private String summary;
13	@Expose
14	private String description;
15	@Expose
16	private boolean nonfiction;
17	@Expose
18	private boolean fiction;
19	
20
21//Getter, Setterは省略
22
23	@Override
24	public int describeContents() {
25		return 0;
26	}
27
28	@Override
29	public void writeToParcel(Parcel dest, int flags) {
30		dest.writeValue(this.id);
31		dest.writeString(this.keyword);
32		dest.writeValue(this.type);
33		dest.writeValue(this.level);
34		dest.writeString(this.summary);
35		dest.writeString(this.description);
36		dest.writeByte(this.nonfiction ? (byte) 1 : (byte) 0);
37		dest.writeByte(this.fiction ? (byte) 1 : (byte) 0);
38	}
39
40	public Word() {
41	}
42
43	protected Word(Parcel in) {
44		this.id = (Integer) in.readValue(Integer.class.getClassLoader());
45		this.keyword = in.readString();
46		this.type = (Integer) in.readValue(Integer.class.getClassLoader());
47		this.level = (Integer) in.readValue(Integer.class.getClassLoader());
48		this.summary = in.readString();
49		this.description = in.readString();
50		this.nonfiction = in.readByte() != 0;
51		this.fiction = in.readByte() != 0;
52	}
53
54	public static final Creator<Word> CREATOR = new Creator<Word>() {
55		@Override
56		public Word createFromParcel(Parcel source) {
57			return new Word(source);
58		}
59
60		@Override
61		public Word[] newArray(int size) {
62			return new Word[size];
63		}
64	};
65}

これをConvert Java File to Kotlin Fileで変換すると赤波線が出ます。
上記のコードをKotlinで記述するにはどうすればいいのか教えてください。
変換後のコードは下記。

Kotlin
1//Kotlin
2class Word : Parcelable {
3    @Expose
4    var id: Int? = null
5    @Expose
6    var keyword: String? = null
7    @Expose
8    var type: Int? = null
9    @Expose
10    var level: Int? = null
11    @Expose
12    var summary: String? = null
13    @Expose
14    var description: String? = null
15    @Expose
16    var isNonfiction: Boolean = false
17    @Expose
18    var isFiction: Boolean = false
19
20    override fun describeContents(): Int {
21        return 0
22    }
23
24    override fun writeToParcel(dest: Parcel, flags: Int) {
25        dest.writeValue(this.id)
26        dest.writeString(this.keyword)
27        dest.writeValue(this.type)
28        dest.writeValue(this.level)
29        dest.writeString(this.summary)
30        dest.writeString(this.description)
31        dest.writeByte(if (this.isNonfiction) 1.toByte() else 0.toByte())
32        dest.writeByte(if (this.isFiction) 1.toByte() else 0.toByte())
33    }
34
35    constructor() {}
36
37    protected constructor(`in`: Parcel) {
38        this.id = `in`.readValue(Int::class.java.classLoader) as Int
39        this.keyword = `in`.readString()
40        this.type = `in`.readValue(Int::class.java.classLoader) as Int
41        this.level = `in`.readValue(Int::class.java.classLoader) as Int
42        this.summary = `in`.readString()
43        this.description = `in`.readString() 
44        this.isNonfiction = `in`.readByte().toInt() != 0
45        this.isFiction = `in`.readByte().toInt() != 0
46    }
47    companion object {
48
49        @JvmField
50        val CREATOR: Parcelable.Creator<Word> = object : Parcelable.Creator<Word> {
51            override fun createFromParcel(source: Parcel): Word {
52                return Word(source)
53            }
54            override fun newArray(size: Int): Array<Word?> {
55                return arrayOfNulls(size)
56            }
57        }
58    }
59}

エラーメッセージ
Caused by: android.os.BadParcelableException: Parcelable protocol requires a Parcelable.Creator object called CREATOR on class com.example.myapplication.Word
意味が分からなかったらすみません。