Validation Callback function not working

[eluser]terry101[/eluser]
ok i have tried what you suggested and this is what i got. Not sure what i'm looking for in this... maybe you might know. any idea where it went wrong?


BENCHMARKS
Loading Time: Base Classes 0.0170
Controller Execution Time ( User / Register ) 0.0500
Total Execution Time 0.0672
GET DATA
No GET data exists
MEMORY USAGE
4,520,560 bytes
POST DATA
$_POST['username'] johnny
$_POST['name']
$_POST['email']
$_POST['password']
$_POST['password_conf']
$_POST['register'] Register
URI STRING
user/register
CLASS/METHOD
user/register
DATABASE: blog QUERIES: 1
0.0016 SELECT *
FROM (`tbregister`)
WHERE `username` = 'johnny'
HTTP HEADERS
HTTP_ACCEPT text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
HTTP_USER_AGENT Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/535.1 (KHTML, like Gecko) Chrome/13.0.782.112 Safari/535.1
HTTP_CONNECTION keep-alive
SERVER_PORT 80
SERVER_NAME localhost
REMOTE_ADDR 127.0.0.1
SERVER_SOFTWARE Apache/2.2.17 (Win32) PHP/5.3.4
HTTP_ACCEPT_LANGUAGE en-US,en;q=0.8
SCRIPT_NAME /code/index.php
REQUEST_METHOD POST
HTTP_HOST
REMOTE_HOST
CONTENT_TYPE application/x-www-form-urlencoded
SERVER_PROTOCOL HTTP/1.1
QUERY_STRING
HTTP_ACCEPT_ENCODING gzip,deflate,sdch
HTTP_X_FORWARDED_FOR
CONFIG VARIABLES
base_url http://localhost/code/
index_page index.php
uri_protocol AUTO
url_suffix
language english
charset UTF-8
enable_hooks
subclass_prefix MY_
permitted_uri_chars a-z 0-9~%.:_\-
allow_get_array 1
enable_query_strings
controller_trigger c
function_trigger m
directory_trigger d
log_threshold 0
log_path
log_date_format Y-m-d H:i
cache_path
encryption_key
sess_cookie_name ci_session
sess_expiration 7200
sess_expire_on_close
sess_encrypt_cookie
sess_use_database
sess_table_name ci_sessions
sess_match_ip
sess_match_useragent 1
sess_time_to_update 300
cookie_prefix
cookie_domain
cookie_path /
cookie_secure
global_xss_filtering
csrf_protection
csrf_token_name csrf_test_name
csrf_cookie_name csrf_cookie_name
csrf_expire 7200
compress_output
time_reference local
rewrite_short_tags
proxy_ips