Warning: mysqli_error() expects exactly 1 parameter, 0 given error

Question

I get the following error

Warning: mysqli_error() expects exactly 1 parameter, 0 given

The problem is with this line of the code:

$query = mysqli_query($myConnection, $sqlCommand) or die (mysqli_error());  

The whole code is

session_start();  require_once "scripts/connect_to_mysql2.php";  //Build Main Navigation menu and gather page data here  $sqlCommand = "SELECT id, linklabel FROM pages ORDER BY pageorder ASC";  $query = mysqli_query($myConnection, $sqlCommand) or die (mysqli_error());   $menuDisplay = ''; while ($row = mysqli_fetch_array($query)) {      $pid = $row["id"];     $linklabel = $row["linklabel"];      $menuDisplay .= '<a href="index.php?pid=' . $pid . '">' . $linklabel . '</a><br />';  }  mysqli_free_result($query);  

The included file has the following line

$myConnection = mysqli_connect("$db_host","$db_username","$db_pass","$db_name") or die ("could not connect to mysql"); with reference to $myConnection, why do I get this error?