How to Publish an App that has a reference to NET MAUI Class Library?

[Verchinderlichtzer]

I want to publish my App with MSIX Sideloading. It contains 2 projects, which are .NET MAUI App and .NET MAUI Class Library. My application is dedicated to running on Windows only. If I publish .NET MAUI App without reference to the class library, it works as expected. But when I added a reference to Class Library, I got some error message.

Improper project configuration: WindowsPackageType is set to None, but PublishAppxPackage is set to true

Here is my Publish Profile configuration

<?xml version="1.0" encoding="utf-8"?>
<Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
  <PropertyGroup>
    <PublishDir>bin\Release\net7.0-android\publish\</PublishDir>
    <PublishProtocol>FileSystem</PublishProtocol>
    <RuntimeIdentifier>win10-x64</RuntimeIdentifier>
    <Platform>Any CPU</Platform>
    <Configuration>Release</Configuration>
    <TargetFramework>net7.0-windows10.0.19041.0</TargetFramework>
    <PublishSingleFile>false</PublishSingleFile>
    <PublishReadyToRun>false</PublishReadyToRun>
    <SelfContained>True</SelfContained>
    <PublishAppxPackage>true</PublishAppxPackage>
    <AppxPackageDir>C:\Users\sujud\Documents\</AppxPackageDir>
  </PropertyGroup>
</Project>

My purpose is to use .NET MAUI Class Library as the App's Model (I use EF Core SQLite)
Is there something missing in my configuration? or is there a better alternative way?