Installation index error

good morning,
after installing nextcloud, in the log section I see the following errors:

when i downloaded the log file, i see all these details:

{“reqId”:“7UYhsYUYSQO3QJRXzYTe”,“level”:3,“time”:“2020-12-21T19:59:10+00:00”,“remoteAddr”:“79.60.79.130”,“user”:“Admin”,“app”:“index”,“method”:“PUT”,“url”:"/apps/user_status/heartbeat",“message”:{“Exception”:“Exception”,“Message”:“Argument 1 passed to OCA\UserStatus\Controller\HeartbeatController::heartbeat() must be of the type string, null given, called in /usr/share/nginx/html/lib/private/AppFramework/Http/Dispatcher.php on line 169”,“Code”:0,“Trace”:[{“file”:"/usr/share/nginx/html/lib/private/AppFramework/App.php",“line”:152,“function”:“dispatch”,“class”:“OC\AppFramework\Http\Dispatcher”,“type”:"->",“args”:[{“class”:“OCA\UserStatus\Controller\HeartbeatController”},“heartbeat”]},{“file”:"/usr/share/nginx/html/lib/private/Route/Router.php",“line”:308,“function”:“main”,“class”:“OC\AppFramework\App”,“type”:"::",“args”:[“OCA\UserStatus\Controller\HeartbeatController”,“heartbeat”,{“class”:“OC\AppFramework\DependencyInjection\DIContainer”},{“action”:null,"_route":“user_status.Heartbeat.heartbeat”}]},{“file”:"/usr/share/nginx/html/lib/base.php",“line”:1008,“function”:“match”,“class”:“OC\Route\Router”,“type”:"->",“args”:["/apps/user_status/heartbeat"]},{“file”:"/usr/share/nginx/html/index.php",“line”:37,“function”:“handleRequest”,“class”:“OC”,“type”:"::",“args”:[]}],“File”:"/usr/share/nginx/html/lib/private/AppFramework/Http/Dispatcher.php",“Line”:110,“Previous”:{“Exception”:“TypeError”,“Message”:“Argument 1 passed to OCA\UserStatus\Controller\HeartbeatController::heartbeat() must be of the type string, null given, called in /usr/share/nginx/html/lib/private/AppFramework/Http/Dispatcher.php on line 169”,“Code”:0,“Trace”:[{“file”:"/usr/share/nginx/html/lib/private/AppFramework/Http/Dispatcher.php",“line”:169,“function”:“heartbeat”,“class”:“OCA\UserStatus\Controller\HeartbeatController”,“type”:"->",“args”:[null]},{“file”:"/usr/share/nginx/html/lib/private/AppFramework/Http/Dispatcher.php",“line”:100,“function”:“executeController”,“class”:“OC\AppFramework\Http\Dispatcher”,“type”:"->",“args”:[{“class”:“OCA\UserStatus\Controller\HeartbeatController”},“heartbeat”]},{“file”:"/usr/share/nginx/html/lib/private/AppFramework/App.php",“line”:152,“function”:“dispatch”,“class”:“OC\AppFramework\Http\Dispatcher”,“type”:"->",“args”:[{“class”:“OCA\UserStatus\Controller\HeartbeatController”},“heartbeat”]},{“file”:"/usr/share/nginx/html/lib/private/Route/Router.php",“line”:308,“function”:“main”,“class”:“OC\AppFramework\App”,“type”:"::",“args”:[“OCA\UserStatus\Controller\HeartbeatController”,“heartbeat”,{“class”:“OC\AppFramework\DependencyInjection\DIContainer”},{“action”:null,"_route":“user_status.Heartbeat.heartbeat”}]},{“file”:"/usr/share/nginx/html/lib/base.php",“line”:1008,“function”:“match”,“class”:“OC\Route\Router”,“type”:"->",“args”:["/apps/user_status/heartbeat"]},{“file”:"/usr/share/nginx/html/index.php",“line”:37,“function”:“handleRequest”,“class”:“OC”,“type”:"::",“args”:[]}],“File”:"/usr/share/nginx/html/apps/user_status/lib/Controller/HeartbeatController.php",“Line”:75},“CustomMessage”:"–"},“userAgent”:“Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/87.0.4280.88 Safari/537.36”,“version”:“20.0.3.2”}

{“reqId”:“IgSwBtXwWKHpfAAgrkze”,“level”:3,“time”:“2020-12-21T19:59:10+00:00”,“remoteAddr”:“79.60.79.130”,“user”:“Admin”,“app”:“index”,“method”:“PUT”,“url”:"/apps/user_status/heartbeat",“message”:{“Exception”:“Exception”,“Message”:“Argument 1 passed to OCA\UserStatus\Controller\HeartbeatController::heartbeat() must be of the type string, null given, called in /usr/share/nginx/html/lib/private/AppFramework/Http/Dispatcher.php on line 169”,“Code”:0,“Trace”:[{“file”:"/usr/share/nginx/html/lib/private/AppFramework/App.php",“line”:152,“function”:“dispatch”,“class”:“OC\AppFramework\Http\Dispatcher”,“type”:"->",“args”:[{“class”:“OCA\UserStatus\Controller\HeartbeatController”},“heartbeat”]},{“file”:"/usr/share/nginx/html/lib/private/Route/Router.php",“line”:308,“function”:“main”,“class”:“OC\AppFramework\App”,“type”:"::",“args”:[“OCA\UserStatus\Controller\HeartbeatController”,“heartbeat”,{“class”:“OC\AppFramework\DependencyInjection\DIContainer”},{“action”:null,"_route":“user_status.Heartbeat.heartbeat”}]},{“file”:"/usr/share/nginx/html/lib/base.php",“line”:1008,“function”:“match”,“class”:“OC\Route\Router”,“type”:"->",“args”:["/apps/user_status/heartbeat"]},{“file”:"/usr/share/nginx/html/index.php",“line”:37,“function”:“handleRequest”,“class”:“OC”,“type”:"::",“args”:[]}],“File”:"/usr/share/nginx/html/lib/private/AppFramework/Http/Dispatcher.php",“Line”:110,“Previous”:{“Exception”:“TypeError”,“Message”:“Argument 1 passed to OCA\UserStatus\Controller\HeartbeatController::heartbeat() must be of the type string, null given, called in /usr/share/nginx/html/lib/private/AppFramework/Http/Dispatcher.php on line 169”,“Code”:0,“Trace”:[{“file”:"/usr/share/nginx/html/lib/private/AppFramework/Http/Dispatcher.php",“line”:169,“function”:“heartbeat”,“class”:“OCA\UserStatus\Controller\HeartbeatController”,“type”:"->",“args”:[null]},{“file”:"/usr/share/nginx/html/lib/private/AppFramework/Http/Dispatcher.php",“line”:100,“function”:“executeController”,“class”:“OC\AppFramework\Http\Dispatcher”,“type”:"->",“args”:[{“class”:“OCA\UserStatus\Controller\HeartbeatController”},“heartbeat”]},{“file”:"/usr/share/nginx/html/lib/private/AppFramework/App.php",“line”:152,“function”:“dispatch”,“class”:“OC\AppFramework\Http\Dispatcher”,“type”:"->",“args”:[{“class”:“OCA\UserStatus\Controller\HeartbeatController”},“heartbeat”]},{“file”:"/usr/share/nginx/html/lib/private/Route/Router.php",“line”:308,“function”:“main”,“class”:“OC\AppFramework\App”,“type”:"::",“args”:[“OCA\UserStatus\Controller\HeartbeatController”,“heartbeat”,{“class”:“OC\AppFramework\DependencyInjection\DIContainer”},{“action”:null,"_route":“user_status.Heartbeat.heartbeat”}]},{“file”:"/usr/share/nginx/html/lib/base.php",“line”:1008,“function”:“match”,“class”:“OC\Route\Router”,“type”:"->",“args”:["/apps/user_status/heartbeat"]},{“file”:"/usr/share/nginx/html/index.php",“line”:37,“function”:“handleRequest”,“class”:“OC”,“type”:"::",“args”:[]}],“File”:"/usr/share/nginx/html/apps/user_status/lib/Controller/HeartbeatController.php",“Line”:75},“CustomMessage”:"–"},“userAgent”:“Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/87.0.4280.88 Safari/537.36”,“version”:“20.0.3.2”}
{“reqId”:“xGt3jGWTd1TIHAGtXOp7”,“level”:2,“time”:“2020-12-22T15:47:47+00:00”,“remoteAddr”:"",“user”:"–",“app”:“appstoreFetcher”,“method”:"",“url”:"–",“message”:“Could not connect to appstore: cURL error 6: Could not resolve host: apps.nextcloud.com (see https://curl.haxx.se/libcurl/c/libcurl-errors.html)”,“userAgent”:"–",“version”:“20.0.3.2”}

how can i solve?

thanks