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A PHP Error was encountered

Severity: Notice

Message: Undefined index: userid

Filename: views/question.php

Line Number: 191

Backtrace:

File: /var/www/html/cnasolution/site/application/views/question.php
Line: 191
Function: _error_handler

File: /var/www/html/cnasolution/site/application/controllers/Questions.php
Line: 419
Function: view

File: /var/www/html/cnasolution/site/index.php
Line: 315
Function: require_once

I am adding custom taxonomy to woo product in wordpress using custom taxonomy and creating a box for it with:

$args = array(         'hierarchical' => true,         'labels' => $labels,         'show_ui' => true,         'meta_box_cb'        => 'drop_cat',         'show_admin_column' => true,         'query_var' => true,         'rewrite' => array( 'slug' => 'type' )     );  

and the custom metabox code :

function drop_cat( $post, $box ) {     $defaults = array('taxonomy' => 'category');     if ( !isset($box['args']) || !is_array($box['args']) )         $args = array();     else         $args = $box['args'];     extract( wp_parse_args($args, $defaults), EXTR_SKIP );     $tax = get_taxonomy($taxonomy);     ?>     
"; // Allows for an empty term set to be sent. 0 is an invalid Term ID and will be ignored by empty() checks. ?> ID, $taxonomy ); //_log($term_obj[0]->term_id)?>
    ID, array( 'taxonomy' => $taxonomy) ) ?>

The problem is that after making new product first value is auto assigning first value for product, which i want to avoid, and afterwards if i choose another option it saves in backend and shows which option was selected, but in single product prints previous selections also, so how do i get it to allow only one option to be selected and default to be empty? or any other way arround this? what i am trying to achive is electronic products energy raiting ( 8 values total ) i want it as dropdown/select to reduce screen size space taken as i have many custom taxonomies.

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