Error message

• Warning: html_entity_decode() expects parameter 1 to be string, array given in decode_entities() (line 463 of /var/www/livetrips.gr/includes/unicode.inc).
• Warning: html_entity_decode() expects parameter 1 to be string, array given in decode_entities() (line 463 of /var/www/livetrips.gr/includes/unicode.inc).
• Warning: Missing argument 1 for views_plugin_argument_lt_custom_list::get_argument(), called in /var/www/livetrips.gr/sites/all/modules/contrib/views/handlers/views_handler_argument.inc on line 777 and defined in views_plugin_argument_lt_custom_list->get_argument() (line 36 of /var/www/livetrips.gr/sites/all/modules/custom/lt_custom/plugins/views_plugin_argument_lt_custom_list.inc).
• Warning: html_entity_decode() expects parameter 1 to be string, array given in decode_entities() (line 463 of /var/www/livetrips.gr/includes/unicode.inc).