3

When I try to run UE 5.6.1, or UE 5.8 (Built from Source Code), I get the following metal error:

screenshot of Error

I have tried modifying the Apple_SDK.json and setting the Max versions to 26.0.0 and LLVM versions are fine.

I tried building u5_main source as well and get the same result. It builds fine, but when it goes to run same thing.

I have tried manually installing the Metal SDK from Xcode Directly, and from command line to no avail. I also tried the various hacks and tricks for the beta versions that I found in different forums.

Here is the Metal Toolchain information:

Metal Toolchain 26.0 (17A324) [com.apple.MobileAsset.MetalToolchain: 17.0 (17A324)] 
   (Installed)

Here is the Apple_SDK.json config:

{
    "//1": "Xcode versions:",
        "MainVersion": "15.2",
        "MinVersion": "15.2.0",
        "MaxVersion": "26.0.0",
    "//2": "!!!",
    "//3": "NOTE: If you update the MaxVersion, double check the AppleVersionToLLVMVersion array below!!!",
    "//4": "!!!",

    "//5": "The versions on Windows are iTunes versions:",
        "MinVersion_Win64": "1100.0.0.0",
        "MaxVersion_Win64": "8999.0",

    "//6": "This is not a version range, but a mapping of Xcode clang versions to LLVM versions, for shared version checks with other clangs",
    "//7": "Version mapping can be found at https://en.wikipedia.org/wiki/Xcode#Toolchain_versions",
    "//8": "The first half of the pair is the first version that is using the second version source LLVM",
    "//9": "For instance, Xcode 16 uses LLVM 17.0.6",
        "AppleVersionToLLVMVersions": [
            "14.0.0-14.0.0",
            "14.0.3-15.0.0",
            "15.0.0-16.0.0",
            "16.0.0-17.0.6",
            "16.3.0-19.1.4"
        ]
}

Any ideas?

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  • 1
    I also got hit with this today, although for iOS 26. I solved the Metal toolchain by installing it with the command line as prompted (needed the -freshstart flag first), but despite that still having issues. Not sure UE supports v26 just yet, so I'm downgrading to Xcode 16.4. Commented Sep 21 at 2:50
  • I think I'll do the same thing. I hate having two versions of xcode, and swapping between cmd-line tools, but I guess I'll have to until Epic comes out with a new fix. I've been pulling the repo daily, takes forever to build on m1max. Commented Sep 22 at 21:31
  • Added the latest version, 26.0.1-18.1.0, in my own case, to the "AppleVersionToLLVMVersions". That's what solved it. In your case, it should be 26.0.0-18.1.0" Commented Oct 10 at 20:39
  • None of that works. I tried updating to the latest and it still won't work. Same error. Commented Oct 11 at 5:19
  • Also according to en.wikipedia.org/wiki/Xcode#Toolchain_versions The versions are supposed to be "26.0.1-19.1.5" for LLVM NOT 18.1.0 Commented Oct 11 at 6:27
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