Wordpress自定义选项页不显示设置字段

我无法让选项页面显示任何添加的输入字段。

add_action( 'admin_menu', 'skd_add_admin_menu' );
add_action( 'admin_init', 'skd_settings_init' );

function skd_add_admin_menu(  ) { 
    add_menu_page( 'skilte-designer', 'Skilte Designer', 'manage_options', 'skilte-designer', 'skilte-designer/skilte-designer-admin.php', plugins_url( '/skilte-designer/img/sign.png' ), 21  );
}

function skd_settings_init(  ) { 
    register_setting( 'pluginPage', 'skd_settings' );
    add_settings_section(
        'skd_pluginPage_section', 
        __( 'Your section description', 'wordpress' ), 
        'skd_settings_section_callback', 
        'pluginPage'
    );
    add_settings_field( 
        'skd_text_field_0', 
        __( 'Settings field description', 'wordpress' ), 
        'skd_text_field_0_render', 
        'pluginPage', 
        'skd_pluginPage_section' 
    );
    add_settings_field( 
        'skd_text_field_1', 
        __( 'Settings field description', 'wordpress' ), 
        'skd_text_field_1_render', 
        'pluginPage', 
        'skd_pluginPage_section' 
    );
    add_settings_field( 
        'skd_text_field_2', 
        __( 'Settings field description', 'wordpress' ), 
        'skd_text_field_2_render', 
        'pluginPage', 
        'skd_pluginPage_section' 
    );
    add_settings_field( 
        'skd_text_field_3', 
        __( 'Settings field description', 'wordpress' ), 
        'skd_text_field_3_render', 
        'pluginPage', 
        'skd_pluginPage_section' 
    );
    add_settings_field( 
        'skd_text_field_4', 
        __( 'Settings field description', 'wordpress' ), 
        'skd_text_field_4_render', 
        'pluginPage', 
        'skd_pluginPage_section' 
    );
    add_settings_field( 
        'skd_text_field_5', 
        __( 'Settings field description', 'wordpress' ), 
        'skd_text_field_5_render', 
        'pluginPage', 
        'skd_pluginPage_section' 
    );

}

function skd_text_field_0_render(  ) { 
    $options = get_option( 'skd_settings' );
    ?>
    <input type='text' name='skd_settings[skd_text_field_0]' value='<?php echo $options['skd_text_field_0']; ?>'>
    <?php
}

function skd_text_field_1_render(  ) { 
    $options = get_option( 'skd_settings' );
    ?>
    <input type='text' name='skd_settings[skd_text_field_1]' value='<?php echo $options['skd_text_field_1']; ?>'>
    <?php
}

function skd_text_field_2_render(  ) { 
    $options = get_option( 'skd_settings' );
    ?>
    <input type='text' name='skd_settings[skd_text_field_2]' value='<?php echo $options['skd_text_field_2']; ?>'>
    <?php
}

function skd_text_field_3_render(  ) { 
    $options = get_option( 'skd_settings' );
    ?>
    <input type='text' name='skd_settings[skd_text_field_3]' value='<?php echo $options['skd_text_field_3']; ?>'>
    <?php
}

function skd_text_field_4_render(  ) { 
    $options = get_option( 'skd_settings' );
    ?>
    <input type='text' name='skd_settings[skd_text_field_4]' value='<?php echo $options['skd_text_field_4']; ?>'>
    <?php
}

function skd_text_field_5_render(  ) { 
    $options = get_option( 'skd_settings' );
    ?>
    <input type='text' name='skd_settings[skd_text_field_5]' value='<?php echo $options['skd_text_field_5']; ?>'>
    <?php
}

function skd_settings_section_callback(  ) { 
    echo __( 'This section description', 'wordpress' );
}

function skd_options_page(  ) { 
    ?>
    <form action='options.php' method='post'>
        <h2>skilte-designer</h2>
        <?php
        settings_fields( 'pluginPage' );
        do_settings_sections( 'pluginPage' );
        submit_button();
        ?>
    </form>
    <?php
}

菜单项已经创建，但我在上面尝试生成的设置字段都没有显示在选项页面上。

我可以点击菜单项，但页面是空的。

我在这里做错了什么？