Can’t compile projects on Tahoe 26.4 and Xcode 26.4

[Sanyalyo]

I want to compile my project with engine version 5.5.4, but every time get errors.

Error from Unreal engine, when loading up the file .uproject: “Could not be compiled. Try rebuilding from source manually.”

And errors when compiling manually:

Generating VisualStudioCode project files:

Discovering modules, targets and source code for project…

Generating data for project indexing…

Exception while generating include data for UnrealEditor: Platform Mac is not a valid platform to build. Check that the SDK is installed properly and that you have the necessary platform support files (DataDrivenPlatformInfo.ini, SDK.json, etc).

Exception while generating include data for LiveLinkHub: Platform Mac is not a valid platform to build. Check that the SDK is installed properly and that you have the necessary platform support files (DataDrivenPlatformInfo.ini, SDK.json, etc).

Exception while generating include data for DotNetPerforceLib: Platform Mac is not a valid platform to build. Check that the SDK is installed properly and that you have the necessary platform support files (DataDrivenPlatformInfo.ini, SDK.json, etc).

Exception while generating include data for EventLoopUnitTests: Platform Mac is not a valid platform to build. Check that the SDK is installed properly and that you have the necessary platform support files (DataDrivenPlatformInfo.ini, SDK.json, etc).

Downgrade of Xcode didn’t help me, because Tahoe 26.4 is compatible only with Xcode 26.X:

https://forums.unrealengine.com/t/platform-mac-is-not-a-valid-platform-to-build-compile-failed/593709/17?u=sanyalyo

And I don’t want to downgrade OS. So, if someone will find the solution, please, leave a comment here

[zoe_wxq]

build engein from source code then everything happy to go….

[Sanyalyo]

Unfortunately, it does not work. When I compile UnrealEditor and ShaderCompileWorker, I get errors like on the screenshots. I set up versions of macOS and Xcode for UnrealEditor and ShaderCompileWorker (1 and 2 screenshots) following the instructions on youtube and try other versions. And nothing helps me. So, I think Tahoe 26.4 is not supports by unreal nowadays. I will wait some fixes

[thor_hzf]

[Sanyalyo]

Solved the problem

Deleted source of unreal engine. Installed dotnet with homebrew and added paths to the file “.zshrc“ (the commands are listed below). Again installed Epic Games using the installer from the website. And then install engine with version 5.5.4. It works perfectly.

The first time, when I installed Epic, I used to have trouble getting a new project up and running. But after installed dotnet and added to “.zshrc“, I do not have any troubles

echo ‘export PATH=“/opt/homebrew/Cellar/dotnet/10.0.105/bin:$PATH”‘ >> ~/.zshrc

echo ‘export PATH=“$DOTNET_ROOT:$PATH”‘ >> ~/.zshrc

source ~/.zshrc

Commands took from this video: https://www.youtube.com/watch?v=1oShKOAWD1o