Fixed a typo. Thanks to Boy Baukema for reporting issue #582.

git-svn-id: https://simplesamlphp.googlecode.com/svn/trunk@3283 44740490-163a-0410-bde0-09ae8108e29a

lib/SAML2/HTTPArtifact.php

@@ -73,7 +73,7 @@ class SAML2_HTTPArtifact extends SAML2_Binding {
 			$sourceId = bin2hex(substr($artifact,4,20));
 
 		}else{
-			throw new Execption('Missing SAMLArt parameter.');
+			throw new Exception('Missing SAMLArt parameter.');
 		}
 
 		$metadataHandler = SimpleSAML_Metadata_MetaDataStorageHandler::getMetadataHandler();