load_plugin_textdomain error

I receive this error while debug mode is enabled:

Notice: load_plugin_textdomain was called with an argument that is
deprecated since version 2.7 with no alternative available. in
/home/xyz/public_html/wp-includes/functions.php on line 3739

I found that is related to this plugin:
https://wordpress.org/plugins/custom-smilies-se/

I really need to have this plugin and would not ignore it; Also plugin author had not responded about this issue.
Could you please guide me to modify it?

Solutions Collecting From Web of "load_plugin_textdomain error"

The plugin calling load_plugin_textdomain() the wrong way:

load_plugin_textdomain(
    'custom_smilies', 
    PLUGINDIR . '/' . dirname(plugin_basename(__FILE__)) . '/lang'
);

You have to change the code to:

load_plugin_textdomain(
    'custom_smilies', 
    false,
    plugin_dir_path(__FILE__) . '/lang'
);

I changed

function clcs_add_pages() {
    add_options_page(__('Smilies Options', 'custom_smilies'), __('Smilies', 'custom_smilies'), 8, CLCSABSFILE, 'clcs_options_admin_page');
}

to this code

function clcs_add_pages() {
    add_options_page(__('Smilies Options', 'custom_smilies'), __('Smilies', 'custom_smilies'), 'manage_network_plugins', CLCSABSFILE, 'clcs_options_admin_page');
} 

and solved! @toscho