wordpress php notice

My php code

function form($instance){

			echo '<p style="text-align:right;"><label  for="'.$this->get_field_id('title').'">' . esc_html__('Title:', 'banyansopno') . '  <input style="width: 200px;" id="'.$this->get_field_id('title').'"  name="'.$this->get_field_name('title').'" type="text"  value="'.$instance['title'].'" /></label></p>';
			 
			echo '<p style="text-align:right;"><label  for="'.$this->get_field_id('posts').'">' . esc_html__('Number of Posts:', 'banyansopno') . ' <input style="width: 50px;"  id="'.$this->get_field_id('posts').'"  name="'.$this->get_field_name('posts').'" type="text"  value="'.$instance['posts'].'" /></label></p>';
			 
			echo '<input type="hidden" id="custom_recent" name="custom_recent" value="1" />';
		 }

Below notice

NOTICE: G:\xampp\htdocs\banyan\wp-content\themes\banyan\inc\custom-widgets.php:65 - Undefined index: title
wp_list_widgets, call_user_func_array, wp_widget_control, call_user_func_array, WP_Widget->form_callback, banyansopno_show_popular->form

NOTICE: G:\xampp\htdocs\banyan\wp-content\themes\banyan\inc\custom-widgets.php:67 - Undefined index: posts
wp_list_widgets, call_user_func_array, wp_widget_control, call_user_func_array, WP_Widget->form_callback, banyansopno_show_popular->form

how to solve this probelm?

Problem solved!