שגיאה בטעינת המטא-מידע

SimpleSAML\Error\Error: METADATA

Backtrace:
0 www/shib13/idp/metadata.php:108 (N/A)
Caused by: Exception: shib13-idp-hosted/'https://sso.ytl.jp/simplesaml/shib13/idp/metadata.php': Unable to load certificate/public key from file "/var/www/html/simplesaml/cert/server.crt".
Backtrace:
2 lib/SimpleSAML/Configuration.php:1366 (SimpleSAML\Configuration::getPublicKeys)
1 lib/SimpleSAML/Utils/Crypto.php:264 (SimpleSAML\Utils\Crypto::loadPublicKey)
0 www/shib13/idp/metadata.php:34 (N/A)