Undefined variable: locale_info

I get the following error when logging onto my site.
Fouttype 8

Fout beschrijving Undefined variable: locale_info

URL www.backrow.nl/events/events_list.php?

Fout bestand /usr/home/backrow/public_html/events/events_list.php

Fout regel 377

SQL query
Below is the code that is arround the 377 line. I can't see anything wrong wit it.
Please advice,
Tom

';
if(strlen($lookupcategory))
{
$code_end.='window.inlineEditing'.$id.'.lookupfield = \''.jsreplace($lookupfield).'\';';
$code_end.='window.inlineEditing'.$id.'.lookuptable = \''.jsreplace($lookuptable).'\';';
$code_end.='window.inlineEditing'.$id.'.categoryvalue = \''.jsreplace($lookupcategory).'\';';
}
}
$editValidateTypes[] = "";
$editValidateFields[] = "Status";
$editValidateTypes[] = "";
$editValidateFields[] = "Soort_optreden";
$editValidateTypes[] = "";
$editValidateFields[] = "Datum_optie";
$editValidateTypes[] = "";
$editValidateFields[] = "Contractant";
$editValidateTypes[] = "";
$editValidateFields[] = "Adres_contractant";
$editValidateTypes[] = "";
$editValidateFields[] = "Postcode_plaats_contractant";