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SimpleSAML\Error\Error: UNHANDLEDEXCEPTION

Backtrace:
1 www/_include.php:17 (SimpleSAML_exception_handler)
0 [builtin] (N/A)
Caused by: Exception: Could not find what key & certificate should be used to sign the metadata for the SAML 2 SP "https://idp.vmri.hu/simplesaml/module.php/saml/sp/metadata.php/default-sp".
Backtrace:
4 lib/SimpleSAML/Metadata/Signer.php:117 (SimpleSAML\Metadata\Signer::findKeyCert)
3 lib/SimpleSAML/Metadata/Signer.php:241 (SimpleSAML\Metadata\Signer::sign)
2 modules/saml/www/sp/metadata.php:274 (require)
1 lib/SimpleSAML/Module.php:266 (SimpleSAML\Module::process)
0 www/module.php:10 (N/A)