arkadaşlarlar anasayfada böyle bir hata alıyorum
yardım bekliyorum
Notice: Undefined variable: Git in E:\EasyPHP 2.0b1\www\portaldeneme\case.php on line 11

case.phpsı

<?php
/*bismillahirrahmanirrahim*/

$Git = $_GET["Git"];

switch ($Git){
	default:
		include("Sayfalar/Anasayfa/index.php");
		break;
		
case "UyeHesabi":
		include("Sayfalar/UyeHesabi/index.php");
		break;

}?>
index.php
<?php
ob_start();

include("aktarimlar.php");

echo "<html>
<head>


<title>".$SiteAdi."</title>
<link rel=\"stylesheet\" href=\"Temalar/".$SiteTema ."/stil.css\" type=\"text/css\">
</head>";

include("ust.php");
echo"<table border=\"1\" border-color=\"#fff\" width=\"100%\" id=\"table1\">
	<tr>
		<td width=\"220\" valign=\"top\">";

include("Bloklar.php");
echo"</td><td valign=\"top\">";

include("case.php");
echo "</td>
		
	</tr>
</table>";
include("alt.php");

?>