Could not find the task 'C/C++ : g++.exe build active file

So I have tried all tutorials when downloading visual studio code plus I also downloaded all required extensions for C++ but still nothing happens when I click run code but if I click on "start debugging", it gives me this error. It's not even running hello world?

my task.json file looks like this:

{
    "folders": [],
    "settings": {
        "C_Cpp.errorSquiggles": "Disabled"
    },
    "launch": {
        "version": "0.2.0",
        "configurations": [
            {
                "name": "g++.exe - Build and debug active file",
                "type": "cppdbg",
                "request": "launch",
                "program": "${fileDirname}\\${fileBasenameNoExtension}.exe",
                "args": [],
                "stopAtEntry": false,
                "cwd": "${fileDirname}",
                "environment": [],
                "externalConsole": false,
                "MIMode": "gdb",
                "miDebuggerPath": "C:\\MinGW\\bin\\gdb.exe",
                "setupCommands": [
                    {
                        "description": "Enable pretty-printing for gdb",
                        "text": "-enable-pretty-printing",
                        "ignoreFailures": true
                    }
                ],
                "preLaunchTask": "C/C++: g++.exe build active file"
            }
        ]
    }
}

This is the error! What to do

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