Error when renaming option

I think you need to set a default value when you use get_option

function plugin_setting_url() {
$options = get_option(‘plugin_options’, array(’embedded_url’=>”));
echo “”;
}

Unless plugin_options already exists, then you would need to use wp_parse_args to merge two arrays.

function plugin_setting_url() {
$options = wp_parse_args(get_option(‘plugin_options’,array()),array(’embedded_url’=>”));
echo “”;
}