404 Error when upgrading from 4.7 to 5.0 b2

Are you sure it's not error 406?

Try adding this line to your .htaccess file: SecFilterEngine Off

Thanks for the help.

adding
SecFilterEngine Off
in .htaccess

Vinay Yadav
PHP Specialist
http://www.vinayras.com

Hi all one, this is the first time i post an entry here. I always read your posts and it is so helpful for me to resolve my project. So now, I have a misunderstanding problem. When I try to make an autocomplete property for my textfield. First time it ran well but later it can't run anyway. Every time I type a letter to call this autocomplete fuction, there is a pop up like that "An Http 404 error occured" and then I cilck ok, it end my work.
This is my textfield (very simple):
$form['items'] = array (
'#type' => 'textfield',
'#title' => 'Block\'s items',
'#default_value' => '',
'#autocomplete_path' => 'dvbanner/inc/autocomplete',
'#description' => 'Enter banner items name that you would like adding this to this block, seprate by comma (,).'
)

This is my autocomplete function:
$regexp = '%(?:^|,\ *)("(?>[^"]*)(?>""[^"]* )*"|(?: [^",]*))%x';
preg_match_all($regexp, $string, $matches);
$array = $matches[1];

// Fetch last tag
$last_string = trim(array_pop($array));
if ($last_string != '') {
$result = db_query (
"SELECT bid, title FROM {dvbanner_item} WHERE LOWER(title) LIKE LOWER('%%%s%%')",
$last_string
);

$prefix = count($array) ? implode(', ', $array) .', ' : '';
$matches = array();

while ($v = db_fetch_object($result)) {
$n = $v->title;
// Commas and quotes in terms are special cases, so encode 'em.
if (strpos($v->title, ',') !== FALSE || strpos($v->title, '"') !== FALSE) {
$n = '"'. str_replace('"', '""', $v->title) .'"';
}

$matches[$prefix . $n] = check_plain($v->title);
}

print drupal_to_js($matches);

Thanks for all your remark and returning your solutions if you want !!!