Failure decrypting Data (openssl private): SAML SSO NExtcloud 16

I configure SSO with SAML on nextcloud. I enter the nextcloud private and public key. But I cannot login. In log, i have errors:

{“reqId”:“2Hpw8Ow0sQwwPJ5JPq8o”,“level”:3,“time”:“2020-02-20T11:06:31+00:00”,“remoteAddr”:“196.170.72.152”,“user”:"–",“app”:“index”,“method”:“POST”,“url”:"/index.php/apps/user_saml/saml/acs",“message”:{“Exception”:“Exception”,“Message”:“Failure decrypting Data (openssl private) - error:0909006C:PEM routines:get_name:no start line”,“Code”:0,“Trace”:[{“file”:"/var/www/html/nextcloud/apps/user_saml/3rdparty/vendor/robrichards/xmlseclibs/src/XMLSecurityKey.php",“line”:565,“function”:“decryptPrivate”,“class”:“RobRichards\XMLSecLibs\XMLSecurityKey”,“type”:"->",“args”:["*** sensitive parameters replaced "]},{“file”:"/var/www/html/nextcloud/apps/user_saml/3rdparty/vendor/robrichards/xmlseclibs/src/XMLSecEnc.php",“line”:262,“function”:“decryptData”,“class”:“RobRichards\XMLSecLibs\XMLSecurityKey”,“type”:"->",“args”:[" sensitive parameters replaced "]},{“file”:"/var/www/html/nextcloud/apps/user_saml/3rdparty/vendor/robrichards/xmlseclibs/src/XMLSecEnc.php",“line”:350,“function”:“decryptNode”,“class”:“RobRichards\XMLSecLibs\XMLSecEnc”,“type”:"->",“args”:[" sensitive parameters replaced ***"]}

Help me solve this issue