Авторизация ЕСИА

[Ekapusta\OAuth2Esia\Security\Signer\Exception\SignException] 
Sign failed as of: Can't open /home/bitrix/www/auth/esia/mfc39.gost.cer for reading, No such file or directory
140034422935808:error:02001002:system library:fopen:No such file or directory:crypto/bio/bss_file.c:69:fopen('/home/bitrix/www/auth/esia/mfc39.gost.cer','r')
140034422935808:error:2006D080:BIO routines:BIO_new_file:no such file:crypto/bio/bss_file.c:76:
unable to load certificate (3)
/home/vendor/ekapusta/oauth2-esia/src/Security/Signer/Exception/SignException.php:38
#0: Ekapusta\OAuth2Esia\Security\Signer\Exception\SignException::signFailedAsOf(string, integer)
	/home/vendor/ekapusta/oauth2-esia/src/Security/Signer/OpensslCli.php:65
#1: Ekapusta\OAuth2Esia\Security\Signer\OpensslCli->run(string, string)
	/home/vendor/ekapusta/oauth2-esia/src/Security/Signer/OpensslCli.php:38
#2: Ekapusta\OAuth2Esia\Security\Signer\OpensslCli->runParameters(array, string)
	/home/vendor/ekapusta/oauth2-esia/src/Security/Signer/OpensslCli.php:31
#3: Ekapusta\OAuth2Esia\Security\Signer\OpensslCli->sign(string)
	/home/vendor/ekapusta/oauth2-esia/src/Provider/EsiaProvider.php:84
#4: Ekapusta\OAuth2Esia\Provider\EsiaProvider->withClientSecret(array)
	/home/vendor/ekapusta/oauth2-esia/src/Provider/EsiaProvider.php:73
#5: Ekapusta\OAuth2Esia\Provider\EsiaProvider->getAuthorizationParameters(array)
	/home/vendor/league/oauth2-client/src/Provider/AbstractProvider.php:389
#6: League\OAuth2\Client\Provider\AbstractProvider->getAuthorizationUrl()
	/home/bitrix/www/esia/auth.php:10