Database Server Exception

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Exception details:
File:   /hsphere/local/home/offalyci/offalycitizensinformation.ie/Inc/CSystem.class
Line:   245
Type:   Code Notice

Undefined index:  Id
Source code:
240           $t = FILEDIR . 'Views/' . $layout . '.Layout.php';
241           echo GetBlock($t, $this->Page);
242           exit;
243       }
244       function GetDefaultLayout() {
245           if ($this->Page['Id'] == 54) return 'Nas';
246           if (isset($this->Page['Ancestors']['NationalAdvocacyService'])) return 'Nas';
247           return 'Index';
248       }
249       function GetPageAlert($body=0) {
250           $a = GetVar($_SESSION, 'PageAlert');
Debug trace:
#3 [Functions.inc:3079]       CSystem->ShowPage()
#2 [CSystem.class:201]        error()
#1 [Index.php:4]              CSystem->LoadPage()