load_plugin_textdomain error

The plugin calling load_plugin_textdomain() the wrong way:

load_plugin_textdomain(
    'custom_smilies', 
    PLUGINDIR . "https://wordpress.stackexchange.com/" . dirname(plugin_basename(__FILE__)) . '/lang'
);

You have to change the code to:

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

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