diff --git a/src/v4/Judge/EMS.Judge.UI/App.xaml.cs b/src/v4/Judge/EMS.Judge.UI/App.xaml.cs
index 41848041a..973d5f215 100644
--- a/src/v4/Judge/EMS.Judge.UI/App.xaml.cs
+++ b/src/v4/Judge/EMS.Judge.UI/App.xaml.cs
@@ -1,6 +1,6 @@
 namespace EMS.Judge.UI;
 
-public partial class App : Application
+public partial class App : Microsoft.Maui.Controls.Application
 {
     public App()
     {
diff --git a/src/v4/Witness/EMS.Witness.UI/App.xaml.cs b/src/v4/Witness/EMS.Witness.UI/App.xaml.cs
index 5b2307ff7..ffa7dff62 100644
--- a/src/v4/Witness/EMS.Witness.UI/App.xaml.cs
+++ b/src/v4/Witness/EMS.Witness.UI/App.xaml.cs
@@ -1,6 +1,6 @@
 namespace EMS.Witness.UI;
 
-public partial class App : Application
+public partial class App : Microsoft.Maui.Controls.Application
 {
     public App()
     {
diff --git a/src/v4/Witness/EMS.Witness.UI/EMS.Witness.UI.csproj b/src/v4/Witness/EMS.Witness.UI/EMS.Witness.UI.csproj
index bc37a17a0..93daceae0 100644
--- a/src/v4/Witness/EMS.Witness.UI/EMS.Witness.UI.csproj
+++ b/src/v4/Witness/EMS.Witness.UI/EMS.Witness.UI.csproj
@@ -53,4 +53,12 @@
         <PackageReference Include="Microsoft.Extensions.Logging.Debug" Version="7.0.0" />
     </ItemGroup>
 
+    <ItemGroup>
+      <ProjectReference Include="..\..\Common\Common.Blazor\Common.Blazor.csproj" />
+      <ProjectReference Include="..\..\Common\Common\Common.csproj" />
+      <ProjectReference Include="..\..\EMS.Common\EMS.Application.csproj" />
+      <ProjectReference Include="..\..\EMS.Domain.Watcher\EMS.Domain.Watcher.csproj" />
+      <ProjectReference Include="..\..\EMS.Domain\EMS.Domain.csproj" />
+    </ItemGroup>
+
 </Project>