installing dotnet 4.8 using windows Installer XML (WIX)

Question

I Just started learning about wix and due to very less learning resources and very less time i was only able to learn little bit about wix i have been assigned a task where i have to install dotnet 4.8 using wix so i started with a setup project and written some code with the help of few resources but i am getting errors when i try to build my project so if someone can please guide how to acheive this task i will be very thankful

so right now my code looks like this

<?xml version="1.0" encoding="UTF-8"?>
<Wix xmlns="http://schemas.microsoft.com/wix/2006/wi"
     xmlns:util="http://schemas.microsoft.com/wix/UtilExtension"
     xmlns:netfx="http://schemas.microsoft.com/wix/NetFxExtension">
    <Product Id="CA3206CD-642B-4871-A1E2-3B56F420038E"
             Name="task1"
             Language="1033"
             Version="1.0.0.0"
             Manufacturer="Naveen Ltd"
             UpgradeCode="593c152e-5028-4c9c-a633-4553055047df">
        
        <Package 
            InstallerVersion="200"
            Compressed="yes"
            InstallScope="perMachine" />
        
        <PropertyRef Id="NETFRAMEWORK48"/>
        <Condition Message="This application requires .NET Framework 4.8">
            <![CDATA[Installed OR NetFramework48Version]]>
        </Condition>
        

        <CustomAction 
            Id="InstallNetFx48" 
            Execute="deferred" 
            Impersonate="no" 
            Return="check"
            FileKey="MyAppSetupFile"
            ExeCommand='"[SourceDir]dotnetRedis\ndp48-x86-x64-allos-enu.exe" /q /norestart' />
        <InstallExecuteSequence>
            <Custom 
                Action="InstallNetFx48"
                After="InstallInitialize"><![CDATA[NOT IsNetFx48Installed]]></Custom>
        </InstallExecuteSequence>

        <MajorUpgrade DowngradeErrorMessage="A newer version of [ProductName] is already installed." />
        
        <MediaTemplate EmbedCab="yes" />

        <UIRef Id="WixUI_Minimal"/>
        
        <Feature 
            Id="ProductFeature"
            Title="task1"
            Level="1">
            <ComponentGroupRef Id="ProductComponents" />
        </Feature>
    </Product>

    <Fragment>
        <Directory Id="TARGETDIR" Name="SourceDir">
            <Directory Id="ProgramFilesFolder">
                <Directory Id="INSTALLFOLDER" Name="task1" />
            </Directory>
        </Directory>
    </Fragment>

    <Fragment>
        <util:RegistrySearch
            Root="HKLM"
            Key="SOFTWARE\Microsoft\NET Framework Setup\NDP\v4\Full"
            Value="Release"
            Variable="NetFx48Release"
            Result="value"
            Win64="yes" />
    </Fragment>
    
    <Fragment>
        <ComponentGroup Id="ProductComponents" Directory="INSTALLFOLDER"/>
    </Fragment>
</Wix>

when i tried to build got these errors

Unresolved reference to symbol 'File:MyAppSetupFile' in section 'Product:{CA3206CD-642B-4871-A1E2-3B56F420038E}'.
Unresolved reference to symbol 'Property:NETFRAMEWORK48' in section 'Product:{CA3206CD-642B-4871-A1E2-3B56F420038E}'.
**
my project structure looks like this**

enter image description here