I recently upgraded to the 5.4.1 version and now i cannot use the following:
1. users & groups
2. add functionality
3. file manager
I get following errors:

1. Users & Groups
Fatal error: Cannot redeclare class UserAttributeKey in /var/www/zmtrx.com/concrete/models/user_attributes.php on line 326

2. Add Functionality
Fatal error: Cannot make static method AttributeKey::getList() non static in class CollectionAttributeKey in /var/www/zmtrx.com/concrete/models/collection_attributes.php on line 193

3. File Manager
Fatal error: Cannot make static method AttributeKey::getList() non static in class FileAttributeKey in /var/www/zmtrx.com/concrete/models/file_attributes.php on line 241


I am also getting this error when I try to post a picture:

Fatal error: Cannot make static method AttributeKey::getList() non static in class FileAttributeKey in /var/www/zmtrx.com/concrete/models/file_attributes.php on line 241

BTW: there isn't anything on line 241. the info below is from lines:67-80.


Here is the code from the .php:
}

function getAttributeKeyID() { return $this->fakID; }

function getList() {
$db = Loader::db();
$q = "select fakID from FileAttributeKeys order by fakID asc";
$r = $db->query($q);
$la = array();
while ($row = $r->fetchRow()) {
$la[] = FileAttributeKey::get($row['fakID']);
}
return $la;
}