# The "SetEnv" task failed unexpectedly

**URL:** <https://forums.unrealengine.com/t/the-setenv-task-failed-unexpectedly/2675115>\
**Category:** Programming & Scripting\
**Tags:** unreal-engine, question\
**Created:** [November 14, 2025, 3:17pm UTC](https://forums.unrealengine.com/t/the-setenv-task-failed-unexpectedly/2675115 "2025-11-14T15:17:07Z")\
**Posts on this page:** 1\
**Showing post:** 10

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**Author:** ![dorgon\_chang](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/dorgon_chang/32/1124941_2.png) [@dorgon\_chang](https://forums.unrealengine.com/u/dorgon_chang)\
**Post date:** [November 18, 2025, 3:41pm UTC](https://forums.unrealengine.com/t/the-setenv-task-failed-unexpectedly/2675115/10 "2025-11-18T15:41:06Z")

</div>

I recently encountered the same error while building my project from Visual Studio:

After some investigation, I noticed that the _Unreal Engine Integration Configuration_ inside Visual Studio now exposes a setting called **Max Include Paths Length (chars)**. This setting corresponds to the `MaxSharedIncludePaths` field inside `BuildConfiguration.xml` (located under `UnrealBuildTool/BuildConfiguration`, as shown in the screenshot blow).

 ![IMG-20251118-2](https://d3kjluh73b9h9o.cloudfront.net/original/4X/e/b/2/eb2e218d77f30f61713bd30ea5bdc162a4439441.png)

![IMG-20251118-3](https://d3kjluh73b9h9o.cloudfront.net/original/4X/a/e/e/aeef2b70804d67be45304ac4687f4cbce5e6add9.png)

 ![IMG-20251118-4](https://d3kjluh73b9h9o.cloudfront.net/original/4X/4/e/7/4e787ef661f0c2315b6820eadd4a2a6c0c474d2f.png)

**Solution:**  
I removed all `MaxSharedIncludePaths` entries from every `BuildConfiguration.xml`, deleted the generated `.sln`, and regenerated the solution. After doing so, the build completed normally and the MSBuild `SetEnv` error no longer occurred.

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