Unhandled exception

An unhandled exception was thrown.

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Debug information

The debug information below may be of interest to the administrator / help desk:

SimpleSAML\Error\Error: UNHANDLEDEXCEPTION
Backtrace:
1 www/_include.php:17 (SimpleSAML_exception_handler)
0 [builtin] (N/A)
Caused by: Exception: Expected first element in the metadata document to be an EntityDescriptor element.
Backtrace:
7 lib/SimpleSAML/Metadata/SAMLParser.php:1440 (SimpleSAML\Metadata\SAMLParser::findEntityDescriptor)
6 lib/SimpleSAML/Metadata/SAMLParser.php:292 (SimpleSAML\Metadata\SAMLParser::parseDocument)
5 lib/SimpleSAML/Metadata/SAMLParser.php:277 (SimpleSAML\Metadata\SAMLParser::parseString)
4 lib/SimpleSAML/Metadata/Sources/MDQ.php:323 (SimpleSAML\Metadata\Sources\MDQ::getMetaData)
3 lib/SimpleSAML/Metadata/MetaDataStorageHandler.php:324 (SimpleSAML\Metadata\MetaDataStorageHandler::getMetaData)
2 lib/SimpleSAML/Metadata/MetaDataStorageHandler.php:363 (SimpleSAML\Metadata\MetaDataStorageHandler::getMetaDataConfig)
1 modules/saml/lib/IdP/SAML2.php:309 (SimpleSAML\Module\saml\IdP\SAML2::receiveAuthnRequest)
0 www/saml2/idp/SSOService.php:26 (N/A)

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How to get help

This error probably is due to some unexpected behaviour or to misconfiguration of SimpleSAMLphp. Contact the administrator of this login service, and send them the error message above.