Forumlar / Cotonti / Extensions / Support / my plugin doesnt work on live server

<?php
 
/* ====================
[BEGIN_COT_EXT]
Hooks=global
Tags=index.tpl:{ARAMA}
Order=99
[END_COT_EXT]
==================== */

$fieldsresss = $db->query($sql = "SELECT field_variants FROM $db_extra_fields WHERE field_name='semt'");
$rowss = $fieldsresss->fetch();
$semt = $rowss['field_variants'];
$fieldsresss = $db->query($sql = "SELECT * FROM $db_extra_fields WHERE field_name='oda'");
$rowss = $fieldsresss->fetch();
$oda = $rowss['field_variants'];

$semtler = cot_selectbox('', 'semt', $semt, '', true, 'id=semt');
$odalar = cot_selectbox('', 'oda', $oda, '1+0,1+1,2+0,2+1,3+1,4+1,5+1,6+1,2+2,3+2,4+2,5+2,6+2,7+1,7+2', true, 'id=oda');
$emlak = cot_selectbox_structure('page', '', 'cate', '', true);
$fiyat = cot_inputbox('text', 'fiyat1', '250', 'id=fiyat1')." - ".cot_inputbox('text', 'fiyat2', '1500', 'id=fiyat2');
$referans = cot_inputbox('text', 'ref', '', 'id=referans');
$metre = cot_inputbox('text', 'metre1', '75', 'id=metre1')." - ".cot_inputbox('text', 'metre2', '300', 'id=metre2');
?>

this is my plugin for a custom search i use on my project. it shows input and selectboxes and works perfectly on my localhost. today i wanted to go live and im getting an error

Fatal error: Call to undefined function cot_selectbox() in /home/ppastelt/public_html/plugins/arama/arama.php on line 18

Edit: i solved the problem by adding cot_incfile to forms.php but i still wonder why it doesnt work on live but works on localhost