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Author: tdykstra

docs/core/tools/sdk-errors/netsdk1032.md

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+---
+title: "NETSDK1144: Optimizing assemblies for size failed"
+description: How to resolve the optimizing for size failed message.
+author: tdykstra
+ms.topic: error-reference
+ms.date: 01/14/2025
+f1_keywords:
+- NETSDK1144
+---
+# NETSDK1144: Duplicate items were included
+
+**This article applies to:** ✔️ .NET Core 2.1.100 SDK and later versions
+
+## Causes of .NET Build Error Code NETSDK1144
+
+One cause of error code `NETSDK1144` is a `UseAppHost` property set to `true` in a project that targets a runtime identifier (RID) that does not support an application host. This typically happens when building a project for a platform that doesn't support generating an executable host.
+
+## How to Fix NETSDK1144 Errors
+
+1. Check the Target Runtime Identifier (RID):
+   - Ensure that the RID specified in your project file is correct and supported for generating an application host.
+   - Some common RIDs are `win-x64`, `linux-x64`, `osx-x64`.
+
+2. Modify the `UseAppHost` Property or remove unsupported RIDs:
+   - If the target RID does not support an application host, set the `UseAppHost` property to `false` in your project file.
+   - If you're targeting multiple RIDs, remove any that don't support generating an application host.
+
+## Example Fix
+
+Here is an example of a `.csproj` file with the `UseAppHost` property set to `false`:
+
+```xml
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net6.0</TargetFramework>
+    <RuntimeIdentifier>linux-arm</RuntimeIdentifier>
+    <UseAppHost>false</UseAppHost>
+  </PropertyGroup>
+
+</Project>
+```
+
+In this example, the `UseAppHost` property is set to `false` because the `linux-arm` RID does not support generating an application host.