Internal server error after installation, anybody knows what's wrong with this?

šŸš§ Installation
21

Only one ERROR log, but I cannot figure out whatā€™s the point.

{
    "reqId": "xnlCLdNOh23VnDhvjPQF",
    "level": 3,
    "time": "2020-07-09T16:48:36+00:00",
    "remoteAddr": "192.168.31.22",
    "user": "--",
    "app": "index",
    "method": "POST",
    "url": "/index.php",
    "message":
    {
        "Exception": "Error",
        "Message": "Call to undefined function OC\\Files\\Storage\\filter_var()",
        "Code": 0,
        "Trace": [
        {
            "file": "/opt/wwwroot/Nextcloud/lib/private/Files/Storage/Common.php",
            "line": 558,
            "function": "scanForInvalidCharacters",
            "class": "OC\\Files\\Storage\\Common",
            "type": "->",
            "args": ["*** sensitive parameter replaced ***", "\\/"]
        },
        {
            "file": "/opt/wwwroot/Nextcloud/lib/private/Files/Storage/Common.php",
            "line": 549,
            "function": "verifyPosixPath",
            "class": "OC\\Files\\Storage\\Common",
            "type": "->",
            "args": ["*** sensitive parameter replaced ***"]
        },
        {
            "file": "/opt/wwwroot/Nextcloud/lib/private/Files/Cache/Scanner.php",
            "line": 136,
            "function": "verifyPath",
            "class": "OC\\Files\\Storage\\Common",
            "type": "->",
            "args": [".", "*** sensitive parameter replaced ***"]
        },
        {
            "file": "/opt/wwwroot/Nextcloud/lib/private/Files/Cache/Scanner.php",
            "line": 338,
            "function": "scanFile",
            "class": "OC\\Files\\Cache\\Scanner",
            "type": "->",
            "args": ["*** sensitive parameter replaced ***", 3, -1, null, false]
        },
        {
            "file": "/opt/wwwroot/Nextcloud/lib/private/Files/Cache/Updater.php",
            "line": 125,
            "function": "scan",
            "class": "OC\\Files\\Cache\\Scanner",
            "type": "->",
            "args": ["*** sensitive parameter replaced ***", false, 3, false]
        },
        {
            "file": "/opt/wwwroot/Nextcloud/lib/private/Files/View.php",
            "line": 323,
            "function": "update",
            "class": "OC\\Files\\Cache\\Updater",
            "type": "->",
            "args": ["*** sensitive parameters replaced ***"]
        },
        {
            "file": "/opt/wwwroot/Nextcloud/lib/private/Files/View.php",
            "line": 1176,
            "function": "writeUpdate",
            "class": "OC\\Files\\View",
            "type": "->",
            "args": [
            {
                "__class__": "OC\\Files\\Storage\\Local"
            }, "*** sensitive parameter replaced ***"]
        },
        {
            "file": "/opt/wwwroot/Nextcloud/lib/private/Files/View.php",
            "line": 271,
            "function": "basicOperation",
            "class": "OC\\Files\\View",
            "type": "->",
            "args": ["mkdir", "/appdata_ocsg5zv5spo7", ["create", "write"]]
        },
        {
            "file": "/opt/wwwroot/Nextcloud/lib/private/Files/Node/Folder.php",
            "line": 164,
            "function": "mkdir",
            "class": "OC\\Files\\View",
            "type": "->",
            "args": ["/appdata_ocsg5zv5spo7"]
        },
        {
            "function": "newFolder",
            "class": "OC\\Files\\Node\\Folder",
            "type": "->",
            "args": ["*** sensitive parameter replaced ***"]
        },
        {
            "file": "/opt/wwwroot/Nextcloud/lib/private/Files/Node/LazyRoot.php",
            "line": 66,
            "function": "call_user_func_array",
            "args": [
                [
                {
                    "__class__": "OC\\Files\\Node\\Root"
                }, "newFolder"],
                ["*** sensitive parameter replaced ***"]
            ]
        },
        {
            "file": "/opt/wwwroot/Nextcloud/lib/private/Files/Node/LazyRoot.php",
            "line": 392,
            "function": "__call",
            "class": "OC\\Files\\Node\\LazyRoot",
            "type": "->",
            "args": ["newFolder", ["*** sensitive parameter replaced ***"]]
        },
        {
            "file": "/opt/wwwroot/Nextcloud/lib/private/Files/AppData/AppData.php",
            "line": 92,
            "function": "newFolder",
            "class": "OC\\Files\\Node\\LazyRoot",
            "type": "->",
            "args": ["*** sensitive parameter replaced ***"]
        },
        {
            "file": "/opt/wwwroot/Nextcloud/lib/private/Files/AppData/AppData.php",
            "line": 110,
            "function": "getAppDataRootFolder",
            "class": "OC\\Files\\AppData\\AppData",
            "type": "->",
            "args": []
        },
        {
            "file": "/opt/wwwroot/Nextcloud/lib/private/Files/AppData/AppData.php",
            "line": 139,
            "function": "getAppDataFolder",
            "class": "OC\\Files\\AppData\\AppData",
            "type": "->",
            "args": []
        },
        {
            "file": "/opt/wwwroot/Nextcloud/lib/private/App/AppStore/Fetcher/Fetcher.php",
            "line": 141,
            "function": "getFolder",
            "class": "OC\\Files\\AppData\\AppData",
            "type": "->",
            "args": ["/"]
        },
        {
            "file": "/opt/wwwroot/Nextcloud/lib/private/Installer.php",
            "line": 221,
            "function": "get",
            "class": "OC\\App\\AppStore\\Fetcher\\Fetcher",
            "type": "->",
            "args": []
        },
        {
            "file": "/opt/wwwroot/Nextcloud/lib/private/Installer.php",
            "line": 506,
            "function": "downloadApp",
            "class": "OC\\Installer",
            "type": "->",
            "args": ["bruteforcesettings"]
        },
        {
            "file": "/opt/wwwroot/Nextcloud/lib/private/Setup.php",
            "line": 411,
            "function": "installAppBundle",
            "class": "OC\\Installer",
            "type": "->",
            "args": [
            {
                "__class__": "OC\\App\\AppStore\\Bundles\\CoreBundle"
            }]
        },
        {
            "file": "/opt/wwwroot/Nextcloud/core/Controller/SetupController.php",
            "line": 75,
            "function": "install",
            "class": "OC\\Setup",
            "type": "->",
            "args": ["*** sensitive parameters replaced ***"]
        },
        {
            "file": "/opt/wwwroot/Nextcloud/lib/base.php",
            "line": 945,
            "function": "run",
            "class": "OC\\Core\\Controller\\SetupController",
            "type": "->",
            "args": ["*** sensitive parameters replaced ***"]
        },
        {
            "file": "/opt/wwwroot/Nextcloud/index.php",
            "line": 37,
            "function": "handleRequest",
            "class": "OC",
            "type": "::",
            "args": []
        }],
        "File": "/opt/wwwroot/Nextcloud/lib/private/Files/Storage/Common.php",
        "Line": 577,
        "CustomMessage": "--"
    },
    "userAgent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:78.0) Gecko/20100101 Firefox/78.0",
    "version": "19.0.0.12"
}
22

Hello,
I sum up. You have nginx and nc without docker.
Can you display your relevant nginx log in /var/log/nginx/error.log?

23

Iā€™ve found out, just like the log says:

Call to undefined function OC\\Files\\Storage\\filter_var()

It turns out that function ā€œfilter_var()ā€ is missing, so I install php7-mod-filterļ¼Œwhich is not mentioned on official documentation. After that, I restart nginx and php-fpm, and everythings fine now.