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

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

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hallo.
wenn ich die index.php seite öffnen will, erscheint folgender fehler:

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

ich verstehe nicht was da falsch läuft, die verbindung zur datenbank ist da, weil wenn man die seite "/administrator" aufruft, kommt man ganz normal ins backend der seite.

ich teste das über localhost (xampp), das php skript ist aus nem tutorial und funktioniert eig auch (auf meinem mac), auf pc kommt der fehler.

hier noch der code

danke für eure hilfe!

  
<?php  
session_start();  
/* Created by Adam Khoury @ www.developphp.com */  
  
require_once "scripts/connect_to_mysql.php";  
// Determine which page ID to use in our query below ---------------------------------------------------------------------------------------  
if (!$_GET['pid']) {  
	$pageid = '1';  
} else {  
	$pageid = ereg_replace("[^0-9]", "", $_GET['pid']); // filter everything but numbers for security  
}  
// Query the body section for the proper page  
$sqlCommand = "SELECT pagebody FROM pages WHERE id='$pageid' LIMIT 1";  
$query = mysqli_query($myConnection, $sqlCommand) or die (mysqli_error());  
while ($row = mysqli_fetch_array($query)) {  
    $body = $row["pagebody"];  
}  
mysqli_free_result($query);  
//---------------------------------------------------------------------------------------------------------------------------------------------------------------  
// Query the module data for display ---------------------------------------------------------------------------------------------------------------  
$sqlCommand = "SELECT modulebody FROM modules WHERE showing='1' AND name='footer' LIMIT 1";  
$query = mysqli_query($myConnection, $sqlCommand) or die (mysqli_error());  
while ($row = mysqli_fetch_array($query)) {  
    $footer = $row["modulebody"];  
}  
mysqli_free_result($query);  
//---------------------------------------------------------------------------------------------------------------------------------------------------------------  
// Query the module data for display ---------------------------------------------------------------------------------------------------------------  
$sqlCommand = "SELECT modulebody FROM modules WHERE showing='1' AND name='custom1' LIMIT 1";  
$query = mysqli_query($myConnection, $sqlCommand) or die (mysqli_error());  
while ($row = mysqli_fetch_array($query)) {  
    $custom1 = $row["modulebody"];  
}  
mysqli_free_result($query);  
//---------------------------------------------------------------------------------------------------------------------------------------------------------------  
// Build Main Navigation menu and gather page data here -----------------------------------------------------------------------------  
$sqlCommand = "SELECT id, linklabel FROM pages WHERE showing='1' ORDER BY id 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($query);  
//---------------------------------------------------------------------------------------------------------------------------------------------------------------  
//mysqli_close($myConnection);  
?>  
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">  
<html xmlns="http://www.w3.org/1999/xhtml">  
<head>  
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />  
<title>My Website</title>  
<style type="text/css">  
<!--  
body,td,th {  
	font-family: Arial Black, Gadget, sans-serif;  
	font-size: 12px;  
}  
body {  
	background-image: url(style/stripBG.jpg);  
	background-repeat: repeat-x;  
	color:#FFF;  
	background-color: #996600;  
}  
a:link {  
	color: #FBE7B7;  
	text-decoration: none;  
}  
a:visited {  
	text-decoration: none;  
	color: #FBE7B7;  
}  
a:hover {  
	text-decoration: underline;  
	color: #FFF;  
}  
a:active {  
	text-decoration:none;  
	color: #FFF;  
}  
-->  
</style></head>  
  
<body>  
<table width="888" border="0" align="center" cellpadding="6">  
  <tr>  
    <td align="center"><table width="100%" border="0" cellpadding="8">  
      <tr>  
        <td colspan="2"><table width="100%" border="0">  
          <tr>  
            <td width="46%"><a href="index.php"><img src="style/logo.png" alt="My Magic Site Logo" width="360" height="80" border="0" /></a></td>  
            <td width="54%" valign="top" bgcolor="#150D00"><?php echo $custom1; ?></td>  
          </tr>  
        </table>  
      </td>  
        </tr>  
      <tr>  
        <td width="22%" valign="top" bgcolor="#150D00" style="border:#6B450C thin solid; line-height:1.5em;">  
		<?php echo $menuDisplay; ?>  
          </td>  
        <td width="78%" valign="top" bgcolor="#150D00" style="border:#6B450C thin solid;">  
        <div style="width:656px; height:400px; overflow: auto;"><?php echo $body; ?></div>  
        </td>  
      </tr>  
      <tr>  
        <td colspan="2" bgcolor="#150D00" style="border:#6B450C thin solid;"><?php echo $footer; ?>   &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</td>  
        </tr>  
    </table>  
    &copy;Copyright 2009 Developphp.com</td>  
  </tr>  
</table>  
<div align="center"><a href="administrator">Admin</a></div><br />  
</body>  
</html>
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