{Need Help} Registration Page.

Righty so from wee while im trying to make this one to work could any one have a look and say wtf im doing wrong here ?
Im trying to force website to send data to my DB but still getting error with configuration on line 18.

<?php
include('../config/dbconf.php');

function encrypt($user, $pass) {
  $user = strtoupper($user);
  $pass = strtoupper($pass);
  return sha1($user.':'.$pass);
}

$username = $_POST['user'];
$password = encrypt($username, $_POST['pass']);
$email = $_POST['email'];

$count = 0;

THIS IS THE ERROR ROW
$stmt = $conn->prepare("SELECT uid FROM BNET WHERE user=:acct_username OR email=:acct_email LIMIT 0,1");
THIS IS THE ERROR ROW

$stmt->bind_param("s", $username);
$stmt->execute();
$stmt->store_result();
if($stmt->num_rows > 0) {
  $count = 1;
}

if($count == 0) {
  $sql = "INSERT INTO BNET (acct_username,acct_passhash1,acct_email) VALUES(?, ?, ?, ?)";
  $stmt = $conn->prepare($sql);
  $stmt->bind_param("sssi",$username, $password, $email);
  if($stmt->execute()) {
    echo "registered";
  }else{
    echo "Failed to register<br>" . $stmt->error;
  }
}else{
  echo "1";
}
?>