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SimpleSAML\Error\Error: UNHANDLEDEXCEPTION

Backtrace:
1 www/_include.php:17 (SimpleSAML_exception_handler)
0 [builtin] (N/A)
Caused by: Exception: authsources['default-sp']: Unable to load certificate/public key from file "/var/simplesamlphp/cert/saml.crt".
Backtrace:
4 lib/SimpleSAML/Configuration.php:1366 (SimpleSAML\Configuration::getPublicKeys)
3 lib/SimpleSAML/Utils/Crypto.php:264 (SimpleSAML\Utils\Crypto::loadPublicKey)
2 modules/saml/www/sp/metadata.php:132 (require)
1 lib/SimpleSAML/Module.php:266 (SimpleSAML\Module::process)
0 www/module.php:10 (N/A)