Problems with functions.php child file

Hi everyone,

I’m using a child theme to work with my Explorable wordpress theme (by Elegant Themes).
I tried to create a functions.php file and add some lines:

* To modify a bit my YARPP plugin
* To modify my user profil page by adding three fields:
– Twitter
– Linkedin
– Public email

My codes are working pretty well when I’m testing it with Wampserver. But when I put my code on the internet, I get this message for the Yarpp line:

Fatal Error : Call to unidentified function phpadd_image_size() in /homez.744/moi/www/wp-content/themes/Explorable-child/functions.php on line 1

and my fields won’t appear on my user profil page, so I couldn’t fill them (pretty logic…) !!!!! *mad*

My functions.php file:

<?php

add_image_size( 'yarpp-thumbnail', 110, 110, true ); // Définir la largeur puis la hauteur des thumbnails de YARPP

/*
#### Big thanks Aky Joe for its tut! ####
Email: akyjoe@thecreatology.com
Edit Custom Author Fields
*/

function extend_author_profile_twit( $twitfields )
{
$twitfields['twitter'] = 'Twitter';
return $twitfields;
}
add_filter('user_contactmethods','extend_author_profile_twit',10,1);

function extend_author_profile_linkin( $linkinfields )
{
$linkinfields['linkedin'] = 'LinkedIn';
return $linkinfields;
}
add_filter('user_contactmethods','extend_author_profile_linkin',10,1);

function extend_author_profile_publicmail( $publicmailfields )
{
$publicmailfields['publicmail'] = 'Mail <em>(public)</em>';
return $publicmailfields;
}
add_filter('user_contactmethods','extend_author_profile_publicmail',10,1);

?>

Could some one help me please?

Thanks a lot,

Jean.