System error and system folders are hidden

Please help. I updated hestia server and now the files don’t appear and there’s system error

Check /var/log/hestia/nginx-error.log

GNU nano 6.2 nginx-error.log
2023/07/02 04:36:33 [error] 794#0: *1 FastCGI sent in stderr: "PHP message: PHP Warning: Undefined array key “look” in /usr/local/hestia/web/templates/pages/list_log.php on li>
2023/07/02 04:58:59 [error] 794#0: *21 FastCGI sent in stderr: "PHP message: PHP Warning: Undefined variable $error in /usr/local/hestia/web/templates/pages/login/login.php on>
2023/07/02 06:06:39 [error] 761#0: *19 FastCGI sent in stderr: "PHP message: PHP Notice: session_start(): Ignoring session_start() because a session is already active in /usr/>
2023/07/02 07:06:37 [error] 758#0: *11 FastCGI sent in stderr: "PHP message: PHP Warning: Undefined variable $error in /usr/local/hestia/web/templates/pages/login/login.php on>
2023/07/02 10:00:08 [error] 758#0: *16 FastCGI sent in stderr: "PHP message: PHP Warning: Undefined variable $error in /usr/local/hestia/web/templates/pages/login/login.php on>
2023/07/02 10:00:14 [error] 758#0: *16 FastCGI sent in stderr: "PHP message: PHP Warning: Undefined variable $ERROR in /usr/local/hestia/web/templates/pages/login/login_1.php >
2023/07/02 10:00:51 [error] 758#0: *16 FastCGI sent in stderr: "PHP message: PHP Warning: Undefined variable $v_record_id in /usr/local/hestia/web/templates/pages/edit_web.php>
2023/07/02 12:10:54 [error] 803#0: *26 FastCGI sent in stderr: "PHP message: PHP Warning: Undefined variable $error in /usr/local/hestia/web/templates/pages/login/login.php on>
2023/07/02 12:10:59 [error] 803#0: *24 FastCGI sent in stderr: "PHP message: PHP Warning: Undefined variable $ERROR in /usr/local/hestia/web/templates/pages/login/login_1.php >
2023/07/02 12:11:28 [error] 803#0: *26 FastCGI sent in stderr: "PHP message: PHP Warning: Undefined variable $ERROR in /usr/local/hestia/web/templates/pages/login/login_1.php >
2023/07/02 12:11:47 [error] 803#0: *26 FastCGI sent in stderr: "PHP message: PHP Warning: Undefined variable $ERROR in /usr/local/hestia/web/templates/pages/login/login_1.php >
2023/07/02 12:12:27 [error] 803#0: *38 FastCGI sent in stderr: "PHP message: PHP Warning: Undefined variable $v_record_id in /usr/local/hestia/web/templates/pages/edit_web.php>
2023/07/02 12:12:35 [error] 803#0: *38 FastCGI sent in stderr: "PHP message: PHP Warning: Undefined array key “v_nginx_cache_duration” in /usr/local/hestia/web/edit/web/index.>
2023/07/02 12:12:37 [error] 803#0: *38 FastCGI sent in stderr: "PHP message: PHP Warning: Undefined variable $v_record_id in /usr/local/hestia/web/templates/pages/edit_web.php>
2023/07/02 12:22:28 [error] 803#0: *49 FastCGI sent in stderr: "PHP message: PHP Warning: Undefined variable $v_record_id in /usr/local/hestia/web/templates/pages/edit_web.php>
2023/07/02 12:25:41 [error] 803#0: *67 FastCGI sent in stderr: "PHP message: PHP Warning: file_get_contents(/etc/ssh/sshd_config): Failed to open stream: Permission denied in >
2023/07/02 12:25:42 [error] 803#0: *67 FastCGI sent in stderr: "PHP message: PHP Warning: file_get_contents(/etc/ssh/sshd_config): Failed to open stream: Permission denied in >
2023/07/02 12:25:42 [error] 803#0: *67 FastCGI sent in stderr: "PHP message: PHP Warning: file_get_contents(/etc/ssh/sshd_config): Failed to open stream: Permission denied in >
2023/07/02 12:25:43 [error] 803#0: *67 FastCGI sent in stderr: "PHP message: PHP Warning: file_get_contents(/etc/ssh/sshd_config): Failed to open stream: Permission denied in >
Stack trace:
#0 /usr/local/hestia/web/fm/vendor/league/flysystem-sftp/src/SftpAdapter.php(208): League\Flysystem\Sftp\SftpAdapter->setConnectionRoot()
#1 /usr/local/hestia/web/fm/vendor/league/flysystem/src/Adapter/AbstractFtpAdapter.php(650): League\Flysystem\Sftp\SftpAdapter->connect()
#2 /usr/local/hestia/web/fm/vendor/league/flysystem-sftp/src/SftpAdapter.php(360): League\Flysystem\Adapter\AbstractFtpAdapter->getConnection()
#3 /usr/local/hestia/web/fm/vendor/league/flysystem/src/Adapter/AbstractFtpAdapter.php(338): League\Flysystem\Sftp\SftpAdapter->listDirectoryContents()
#4 /usr/local/hestia/web/fm/vendor/league/flysystem/src/Filesystem.php(272): League\Flysystem\Adapter\AbstractFtpAdapter->listContents()
#5 /usr/local/hestia/web/fm/backend/Services/Storage/Filesystem.php(199): League" while reading response header from upstream, client: 41.114.15.2, server: _, request: "POST />
2023/07/02 12:25:44 [error] 803#0: *67 FastCGI sent in stderr: "PHP message: PHP Warning: file_get_contents(/etc/ssh/sshd_config): Failed to open stream: Permission denied in >
2023/07/02 12:25:48 [error] 803#0: *67 FastCGI sent in stderr: "PHP message: PHP Warning: file_get_contents(/etc/ssh/sshd_config): Failed to open stream: Permission denied in >
2023/07/02 12:25:49 [error] 803#0: *67 FastCGI sent in stderr: "PHP message: PHP Warning: file_get_contents(/etc/ssh/sshd_config): Failed to open stream: Permission denied in >
2023/07/02 12:25:50 [error] 803#0: *67 FastCGI sent in stderr: "PHP message: PHP Warning: file_get_contents(/etc/ssh/sshd_config): Failed to open stream: Permission denied in >
Stack trace:
#0 /usr/local/hestia/web/fm/vendor/league/flysystem-sftp/src/SftpAdapter.php(208): League\Flysystem\Sftp\SftpAdapter->setConnectionRoot()
#1 /usr/local/hestia/web/fm/vendor/league/flysystem/src/Adapter/AbstractFtpAdapter.php(650): League\Flysystem\Sftp\SftpAdapter->connect()
#2 /usr/local/hestia/web/fm/vendor/league/flysystem-sftp/src/SftpAdapter.php(360): League\Flysystem\Adapter\AbstractFtpAdapter->getConnection()
#3 /usr/local/hestia/web/fm/vendor/league/flysystem/src/Adapter/AbstractFtpAdapter.php(338): League\Flysystem\Sftp\SftpAdapter->listDirectoryContents()
#4 /usr/local/hestia/web/fm/vendor/league/flysystem/src/Filesystem.php(272): League\Flysystem\Adapter\AbstractFtpAdapter->listContents()
#5 /usr/local/hestia/web/fm/backend/Services/Storage/Filesystem.php(199): League" while reading response header from upstream, client: 41.114.15.2, server: _, request: "POST />
2023/07/02 12:25:58 [error] 803#0: *79 FastCGI sent in stderr: "PHP message: PHP Warning: file_get_contents(/etc/ssh/sshd_config): Failed to open stream: Permission denied in >
2023/07/02 12:26:00 [error] 803#0: *79 FastCGI sent in stderr: "PHP message: PHP Warning: file_get_contents(/etc/ssh/sshd_config): Failed to open stream: Permission denied in >
2023/07/02 12:26:00 [error] 803#0: *79 FastCGI sent in stderr: "PHP message: PHP Warning: file_get_contents(/etc/ssh/sshd_config): Failed to open stream: Permission denied in >
2023/07/02 12:26:01 [error] 803#0: *79 FastCGI sent in stderr: "PHP message: PHP Warning: file_get_contents(/etc/ssh/sshd_config): Failed to open stream: Permission denied in >
Stack trace:
#0 /usr/local/hestia/web/fm/vendor/league/flysystem-sftp/src/SftpAdapter.php(208): League\Flysystem\Sftp\SftpAdapter->setConnectionRoot()
#1 /usr/local/hestia/web/fm/vendor/league/flysystem/src/Adapter/AbstractFtpAdapter.php(650): League\Flysystem\Sftp\SftpAdapter->connect()
#2 /usr/local/hestia/web/fm/vendor/league/flysystem-sftp/src/SftpAdapter.php(360): League\Flysystem\Adapter\AbstractFtpAdapter->getConnection()
#3 /usr/local/hestia/web/fm/vendor/league/flysystem/src/Adapter/AbstractFtpAdapter.php(338): League\Flysystem\Sftp\SftpAdapter->listDirectoryContents()
#4 /usr/local/hestia/web/fm/vendor/league/flysystem/src/Filesystem.php(272): League\Flysystem\Adapter\AbstractFtpAdapter->listContents()
#5 /usr/local/hestia/web/fm/backend/Services/Storage/Filesystem.php(199): League" while reading response header from upstream, client: 41.114.15.2, server: _, request: "POST />
2023/07/02 12:26:01 [error] 803#0: *79 FastCGI sent in stderr: "PHP message: PHP Warning: file_get_contents(/etc/ssh/sshd_config): Failed to open stream: Permission denied in >
2023/07/02 12:26:03 [error] 803#0: *79 FastCGI sent in stderr: "PHP message: PHP Warning: file_get_contents(/etc/ssh/sshd_config): Failed to open stream: Permission denied in >
2023/07/02 12:26:04 [error] 803#0: *79 FastCGI sent in stderr: "PHP message: PHP Warning: file_get_contents(/etc/ssh/sshd_config): Failed to open stream: Permission denied in >
2023/07/02 12:26:05 [error] 803#0: *79 FastCGI sent in stderr: "PHP message: PHP Warning: file_get_contents(/etc/ssh/sshd_config): Failed to open stream: Permission denied in >
Stack trace:
#0 /usr/local/hestia/web/fm/vendor/league/flysystem-sftp/src/SftpAdapter.php(208): League\Flysystem\Sftp\SftpAdapter->setConnectionRoot()
#1 /usr/local/hestia/web/fm/vendor/league/flysystem/src/Adapter/AbstractFtpAdapter.php(650): League\Flysystem\Sftp\SftpAdapter->connect()
#2 /usr/local/hestia/web/fm/vendor/league/flysystem-sftp/src/SftpAdapter.php(360): League\Flysystem\Adapter\AbstractFtpAdapter->getConnection()

if i would need to guess: have you used either the command chown or chmod recently?

No Sir. i have not used the commands. I just changed admin password and updated hestia

What do I need to do to fix this?

2023/07/02 12:26:01 [error] 803#0: *79 FastCGI sent in stderr: "PHP message: PHP Warning: file_get_contents(/etc/ssh/sshd_config): Failed to open stream: Permission denied in >
Stack trace:

sshd_config is not readable by the admin user

I am not experienced in Linux. Which command do I use to fix this?