WMC9999 'using' is an unexpected token in Microsoft.UI.Xaml.Markup.Compiler.interop.targets

[JPTGamesAndApps]

Hello,

I am getting this error while building a WinUI3 desktop project.

WMC9999 'using' is an unexpected token. Expecting white space. Line 8, position 18.
ProjectNameWinUI3
C:\Users\josep.nuget\packages\microsoft.projectreunion.winui\0.8.0\buildTransitive C:\Users<username>.nuget\packages\microsoft.projectreunion.winui\0.8.0\buildTransitive\Microsoft.UI.Xaml.Markup.Compiler.interop.targets 465

The WMC9999 points to MS website with code not found info.

Not sure what is causing this or how to fix this.

The line 465 points to this:

            <Output Condition=" '$(ManagedAssembly)'!='false' " ItemName="Compile"   TaskParameter="GeneratedCodeFiles" />

            <!--
                FileWrites is used in Microsoft.Common.Targets for "Clean" build
            -->
            <Output ItemName="FileWrites" TaskParameter="GeneratedCodeFiles" />
            <Output ItemName="FileWrites" TaskParameter="GeneratedXamlFiles" />
            <Output ItemName="FileWrites" TaskParameter="GeneratedXbfFiles" />
            <Output ItemName="_GeneratedCodeFiles" TaskParameter="GeneratedCodeFiles" />
            <Output ItemName="_GeneratedXamlFiles" TaskParameter="GeneratedXamlFiles" />
            <Output ItemName="_GeneratedXbfFiles" TaskParameter="GeneratedXbfFiles" />
        </CompileXaml>