【Unity】LocalizationのStringTableが見つからない

LocalizationのStringTableが見つかりません。
LocalizedStringTableが通っているのに、なぜStringTableがひっかかるのでしょうか。
もしご存知でしたらご教授ください。

-エラー内容
error CS0246: The type or namespace name 'StringTable' could not be found (are you missing a using directive or an assembly reference?)

-Unity 2020.3.21f1
-Localization Version 1.0.5

-公式
https://docs.unity3d.com/Packages/com.unity.localization@0.9/api/UnityEngine.Localization.LocalizedStringTable.html

C#
1using System.Collections;
2using System.Collections.Generic;
3using UnityEngine;
4using UnityEngine.Localization;
5
6public class LocalizedStringTableExample : MonoBehaviour
7{
8    public LocalizedStringTable m_StringTable = new LocalizedStringTable{ TableReference = "My Strings" };
9
10    string m_TranslatedStringHello;
11    string m_TranslatedStringGoodbye;
12    string m_TranslatedStringThisIsATest;
13
14    void OnEnable()
15    {
16        m_StringTable.RegisterChangeHandler(LoadStrings);
17    }
18
19    void OnDisable()
20    {
21        m_StringTable.ClearChangeHandler();
22    }
23
24    void LoadStrings(StringTable stringTable)
25    {
26        m_TranslatedStringHello = GetLocalizedString(stringTable, "Hello");
27        m_TranslatedStringGoodbye = GetLocalizedString(stringTable, "Goodbye");
28        m_TranslatedStringThisIsATest = GetLocalizedString(stringTable, "This is a test");
29    }
30
31    static string GetLocalizedString(StringTable table, string entryName)
32    {
33        var entry = table.GetEntry(entryName);
34        return entry.GetLocalizedString(); // We can pass in optional arguments for Smart Format or String.Format here.
35    }
36
37    void OnGUI()
38    {
39        if (!LocalizationSettings.InitializationOperation.IsDone)
40        {
41            GUILayout.Label("Initializing Localization");
42            return;
43        }
44
45        GUILayout.Label(m_TranslatedStringThisIsATest);
46        GUILayout.Label(m_TranslatedStringHello);
47        GUILayout.Label(m_TranslatedStringGoodbye);
48    }
49}