Couldn't find target rules file for target 'UnrealPak' in rules assembly

Development Platform & Builds
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1

Hello guys,

I am making a script to automate the building of an unreal project.
Until now, I was calling the RunUAT.bat file with the BuildCookRun mode and it was working flawlessly.

But then I decided to replace the BuildCookRun mode by the BuildEditor one as I only needed to build the editor and not the playable game itself.
And now, every time I call the RunUAT file, I get this error after every action has been build.

Running: C:\Program Files\Epic Games\UE_5.2\Engine\Binaries\ThirdParty\DotNet\6.0.302\windows\dotnet.exe "C:\Program Files\Epic Games\UE_5.2\Engine\Binaries\DotNET\UnrealBuildTool\UnrealBuildTool.dll" UnrealPak Win64 Development -Project={project}.uproject  {project}.uproject -NoUBTMakefiles  -Manifest={ProjectPath}\Intermediate\Build\Manifest.xml -NoHotReload -log="{User}\AppData\Roaming\Unreal Engine\AutomationTool\Logs\C+Program+Files+Epic+Games+UE_5.2\UBT-UnrealPak-Win64-Development.txt"
Log file: {User}\AppData\Roaming\Unreal Engine\AutomationTool\Logs\C+Program+Files+Epic+Games+UE_5.2\UBT-UnrealPak-Win64-Development.txt
Using 'git status' to determine working set for adaptive non-unity build (D:\autobattlerpreprod).

Couldn't find target rules file for target 'UnrealPak' in rules assembly 'UE5Rules, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null'.
Location: C:\Program Files\Epic Games\UE_5.2\Engine\Intermediate\Build\BuildRules\UE5Rules.dll
Target rules found:

Took 3,1954861s to run dotnet.exe, ExitCode=6

Here is the way I call the RunUAT file

{PathToBatchFiles}/RunUAT.bat BuildEditor -project="../{projectName}.uproject" -clean -nop4 -nodebuginfo -targetplatform=Win64 -build -utf8output

Does anyone know how to fix it ?

2

Run the command with -notools.

3

I`m confuse, what do you mean by “I need to build the editor only” ?
By looking at your windows path I see you are using the Epic launcher version of Unreal.
How you planning to build the editor without the source code ?

4

Running into the same issue: my project builds without issues in the Editor but when I try to set up a build script, the build fails.
Taking 3 steps for this:

  1. Generate Project files
  2. Run UBT
  3. Run UAT

(the dotnet part of) UBT complains about a missing target file:

Couldn’t find target rules file for target ‘[module]’ in rules assembly ‘UE5Rules, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null’

While the target file does exist in the Source folder and the module is configured (as Runtime) in the .uproject file.

When I leave out the ubt step, uat complains about the missing module:

Message dialog closed, result: Ok, title: Message, text: The game module ‘[module]’ could not be found. Please ensure that this module exists and that it is compiled.

I have copied the uat parameters which are reported in the log when running the (successful) build in the editor.

I am running the script from a clean project (no Binaries, Intermediate etc) and the project contains 1 custom plugin.

[edit: just realized this is an old thread, made a new post: Project builds using Rider but UBT fails when running a build script]