Nextcloud 16.0.4:Internal Server Error

hello!I newly configured my router with entware to enable ONMP.
Nextcloud version: Nextcloud 16.0.4
Operating system and version: Entware
nginx version: 1.15.8
PHP version: 7.2.17
phpMyAdmin version:4.9.0.1

The issue you are facing:

Internal Server Error

The server was unable to complete your request.

If this happens again, please send the technical details below to the server administrator.

More details can be found in the server log.
Technical details

Remote Address: xx.xx.xx.xxx
Request ID: D9pbhRn57BTe6bj99778

nextcloud.log:
{“reqId”:“D9pbhRn57BTe6bj99778”,“level”:3,“time”:“2019-08-16T15:31:37+00:00”,“remoteAddr”:“192.168.16.7”,“user”:“root”,“app”:“no app in context”,“method”:“POST”,“url”:"/login",“message”:“Something is wrong with your openssl setup: error:02001002:system library:fopen:No such file or directory, error:2006D080:BIO routines:BIO_new_file:no such file, error:0E064002:configuration file routines:CONF_load:system lib, error:02001002:system library:fopen:No such file or directory, error:2006D080:BIO routines:BIO_new_file:no such file, error:0E064002:configuration file routines:CONF_load:system lib”,“userAgent”:“Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/64.0.3282.140 Safari/537.36 Edge/18.17763”,“version”:“16.0.4.1”}
{“reqId”:“D9pbhRn57BTe6bj99778”,“level”:3,“time”:“2019-08-16T15:31:37+00:00”,“remoteAddr”:“192.168.16.7”,“user”:“root”,“app”:“PHP”,“method”:“POST”,“url”:"/login",“message”:“openssl_pkey_export(): cannot get key from parameter 1 at /opt/wwwroot/Nextcloud/lib/private/Authentication/Token/PublicKeyTokenProvider.php#302”,“userAgent”:“Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/64.0.3282.140 Safari/537.36 Edge/18.17763”,“version”:“16.0.4.1”}
{“reqId”:“D9pbhRn57BTe6bj99778”,“level”:3,“time”:“2019-08-16T15:31:37+00:00”,“remoteAddr”:“192.168.16.7”,“user”:“root”,“app”:“no app in context”,“method”:“POST”,“url”:"/login",“message”:“Something is wrong with your openssl setup: “,“userAgent”:“Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/64.0.3282.140 Safari/537.36 Edge/18.17763”,“version”:“16.0.4.1”}
{“reqId”:“D9pbhRn57BTe6bj99778”,“level”:3,“time”:“2019-08-16T15:31:37+00:00”,“remoteAddr”:“192.168.16.7”,“user”:“root”,“app”:“index”,“method”:“POST”,“url”:”/login”,“message”:{“Exception”:“TypeError”,“Message”:“openssl_pkey_get_details() expects parameter 1 to be resource, boolean given”,“Code”:0,“Trace”:[{“file”:"/opt/wwwroot/Nextcloud/lib/private/Authentication/Token/PublicKeyTokenProvider.php",“line”:307,“function”:“openssl_pkey_get_details”,“args”:[false]},{“file”:"/opt/wwwroot/Nextcloud/lib/private/Authentication/Token/PublicKeyTokenProvider.php",“line”:70,“function”:“newToken”,“class”:“OC\Authentication\Token\PublicKeyTokenProvider”,“type”:"->",“args”:["*** sensitive parameter replaced "," sensitive parameter replaced "," sensitive parameter replaced "," sensitive parameter replaced "," sensitive parameter replaced "," sensitive parameter replaced "," sensitive parameter replaced "]},{“file”:"/opt/wwwroot/Nextcloud/lib/private/Authentication/Token/Manager.php",“line”:69,“function”:“generateToken”,“class”:“OC\Authentication\Token\PublicKeyTokenProvider”,“type”:"->",“args”:[" sensitive parameters replaced "]},{“file”:"/opt/wwwroot/Nextcloud/lib/private/User/Session.php",“line”:646,“function”:“generateToken”,“class”:“OC\Authentication\Token\Manager”,“type”:"->",“args”:[" sensitive parameters replaced "]},{“file”:"/opt/wwwroot/Nextcloud/core/Controller/LoginController.php",“line”:344,“function”:“createSessionToken”,“class”:“OC\User\Session”,“type”:"->",“args”:[" sensitive parameters replaced "]},{“file”:"/opt/wwwroot/Nextcloud/lib/private/AppFramework/Http/Dispatcher.php",“line”:166,“function”:“tryLogin”,“class”:“OC\Core\Controller\LoginController”,“type”:"->",“args”:[" sensitive parameters replaced ***"]},{“file”:"/opt/wwwroot/Nextcloud/lib/private/AppFramework/Http/Dispatcher.php",“line”:99,“function”:“executeController”,“class”:“OC\AppFramework\Http\Dispatcher”,“type”:"->",“args”:[{“class”:“OC\Core\Controller\LoginController”},“tryLogin”]},{“file”:"/opt/wwwroot/Nextcloud/lib/private/AppFramework/App.php",“line”:126,“function”:“dispatch”,“class”:“OC\AppFramework\Http\Dispatcher”,“type”:"->",“args”:[{“class”:“OC\Core\Controller\LoginController”},“tryLogin”]},{“file”:"/opt/wwwroot/Nextcloud/lib/private/AppFramework/Routing/RouteActionHandler.php",“line”:47,“function”:“main”,“class”:“OC\AppFramework\App”,“type”:"::",“args”:[“OC\Core\Controller\LoginController”,“tryLogin”,{“class”:“OC\AppFramework\DependencyInjection\DIContainer”},{"_route":“core.login.tryLogin”}]},{“function”:"__invoke",“class”:“OC\AppFramework\Routing\RouteActionHandler”,“type”:"->",“args”:[{"_route":“core.login.tryLogin”}]},{“file”:"/opt/wwwroot/Nextcloud/lib/private/Route/Router.php",“line”:297,“function”:“call_user_func”,“args”:[{“class”:“OC\AppFramework\Routing\RouteActionHandler”},{"_route":“core.login.tryLogin”}]},{“file”:"/opt/wwwroot/Nextcloud/lib/base.php",“line”:975,“function”:“match”,“class”:“OC\Route\Router”,“type”:"->",“args”:["/login"]},{“file”:"/opt/wwwroot/Nextcloud/index.php",“line”:42,“function”:“handleRequest”,“class”:“OC”,“type”:"::",“args”:}],“File”:"/opt/wwwroot/Nextcloud/lib/private/Authentication/Token/PublicKeyTokenProvider.php",“Line”:307,“CustomMessage”:"–"},“userAgent”:“Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/64.0.3282.140 Safari/537.36 Edge/18.17763”,“version”:“16.0.4.1”}