Try changing this part of code, line 270 cookie-notice.php, from this:
/**
* Regiseter plugin settings.
*/
public function register_settings() {
register_setting( 'cookie_notice_options', 'cookie_notice_options', array( $this, 'validate_options' ) );
// configuration
add_settings_section( 'cookie_notice_configuration', __( 'Configuration', 'cookie-notice' ), array( $this, 'cn_section_configuration' ), 'cookie_notice_options' );
add_settings_field( 'cn_message_text', __( 'Message', 'cookie-notice' ), array( $this, 'cn_message_text' ), 'cookie_notice_options', 'cookie_notice_configuration' );
add_settings_field( 'cn_accept_text', __( 'Button text', 'cookie-notice' ), array( $this, 'cn_accept_text' ), 'cookie_notice_options', 'cookie_notice_configuration' );
add_settings_field( 'cn_see_more', __( 'More info link', 'cookie-notice' ), array( $this, 'cn_see_more' ), 'cookie_notice_options', 'cookie_notice_configuration' );
add_settings_field( 'cn_link_target', __( 'Link target', 'cookie-notice' ), array( $this, 'cn_link_target' ), 'cookie_notice_options', 'cookie_notice_configuration' );
add_settings_field( 'cn_refuse_opt', __( 'Refuse button', 'cookie-notice' ), array( $this, 'cn_refuse_opt' ), 'cookie_notice_options', 'cookie_notice_configuration' );
add_settings_field( 'cn_on_scroll', __( 'On scroll', 'cookie-notice' ), array( $this, 'cn_on_scroll' ), 'cookie_notice_options', 'cookie_notice_configuration' );
add_settings_field( 'cn_time', __( 'Cookie expiry', 'cookie-notice' ), array( $this, 'cn_time' ), 'cookie_notice_options', 'cookie_notice_configuration' );
add_settings_field( 'cn_script_placement', __( 'Script placement', 'cookie-notice' ), array( $this, 'cn_script_placement' ), 'cookie_notice_options', 'cookie_notice_configuration' );
add_settings_field( 'cn_deactivation_delete', __( 'Deactivation', 'cookie-notice' ), array( $this, 'cn_deactivation_delete' ), 'cookie_notice_options', 'cookie_notice_configuration' );
// design
add_settings_section( 'cookie_notice_design', __( 'Design', 'cookie-notice' ), array( $this, 'cn_section_design' ), 'cookie_notice_options' );
add_settings_field( 'cn_position', __( 'Position', 'cookie-notice' ), array( $this, 'cn_position' ), 'cookie_notice_options', 'cookie_notice_design' );
add_settings_field( 'cn_hide_effect', __( 'Animation', 'cookie-notice' ), array( $this, 'cn_hide_effect' ), 'cookie_notice_options', 'cookie_notice_design' );
add_settings_field( 'cn_css_style', __( 'Button style', 'cookie-notice' ), array( $this, 'cn_css_style' ), 'cookie_notice_options', 'cookie_notice_design' );
add_settings_field( 'cn_colors', __( 'Colors', 'cookie-notice' ), array( $this, 'cn_colors' ), 'cookie_notice_options', 'cookie_notice_design' );
}
to this:
/**
* Regiseter plugin settings.
*/
public function register_settings() {
register_setting( 'cookie_notice_options', 'cookie_notice_options', array( $this, 'validate_options' ) );
// configuration
add_settings_section( 'cookie_notice_configuration', __( 'Configuration', 'cookie-notice' ), array( $this, 'cn_section_configuration' ), 'cookie_notice_options' );
add_settings_field( 'cn_message_text', __( 'Message', 'cookie-notice' ), array( $this, 'cn_message_text' ), 'cookie_notice_options', 'cookie_notice_configuration' );
add_settings_field( 'cn_accept_text', __( 'Button text', 'cookie-notice' ), array( $this, 'cn_accept_text' ), 'cookie_notice_options', 'cookie_notice_configuration' );
add_settings_field( 'cn_see_more', __( 'More info link', 'cookie-notice' ), array( $this, 'cn_see_more' ), 'cookie_notice_options', 'cookie_notice_configuration' );
add_settings_field( 'cn_link_target', __( 'Link target', 'cookie-notice' ), array( $this, 'cn_link_target' ), 'cookie_notice_options', 'cookie_notice_configuration' );
add_settings_field( 'cn_refuse_opt', __( 'Refuse button', 'cookie-notice' ), array( $this, 'cn_refuse_opt' ), 'cookie_notice_options', 'cookie_notice_configuration' );
add_settings_field( 'cn_on_scroll', __( 'On scroll', 'cookie-notice' ), array( $this, 'cn_on_scroll' ), 'cookie_notice_options', 'cookie_notice_configuration' );
add_settings_field( 'cn_time', __( 'Cookie expiry', 'cookie-notice' ), array( $this, 'cn_time' ), 'cookie_notice_options', 'cookie_notice_configuration' );
add_settings_field( 'cn_script_placement', __( 'Script placement', 'cookie-notice' ), array( $this, 'cn_script_placement' ), 'cookie_notice_options', 'cookie_notice_configuration' );
add_settings_field( 'cn_deactivation_delete', __( 'Deactivation', 'cookie-notice' ), array( $this, 'cn_deactivation_delete' ), 'cookie_notice_options', 'cookie_notice_configuration' );
// design
add_settings_section( 'cookie_notice_design', __( 'Design', 'cookie-notice' ), array( $this, 'cn_section_design' ), 'cookie_notice_options' );
add_settings_field( 'cn_position', __( 'Position', 'cookie-notice' ), array( $this, 'cn_position' ), 'cookie_notice_options', 'cookie_notice_design' );
add_settings_field( 'cn_hide_effect', __( 'Animation', 'cookie-notice' ), array( $this, 'cn_hide_effect' ), 'cookie_notice_options', 'cookie_notice_design' );
add_settings_field( 'cn_css_style', __( 'Button style', 'cookie-notice' ), array( $this, 'cn_css_style' ), 'cookie_notice_options', 'cookie_notice_design' );
add_settings_field( 'cn_colors', __( 'Colors', 'cookie-notice' ), array( $this, 'cn_colors' ), 'cookie_notice_options', 'cookie_notice_design' );
}
/**
* Section callback: fix for WP < 3.3
*/
public function cn_section_configuration() {}
public function cn_section_design() {}
And provide some feedback, if that solves the issue.