Unity-Technologies/UnityCsReference · error · NotSupportedException

Unknown EditorPluginCPUArchitecture value: {architecture}

Error message

Unknown EditorPluginCPUArchitecture value: {architecture}

What it means

Mirrors error 343 but for EditorPluginCPUArchitecture. The switch handles x86_64, ARM64, and AnyCPU; the default branch throws NotSupportedException for an unrecognized value. Editor plugins run in the editor process, so this enum is narrower than the desktop player one.

Source

Thrown at Editor/Mono/ImportSettings/EditorPluginImporterExtension.cs:132

                    currentOS = osValue;
                }
            }

            static string GetArchitectureName(EditorPluginOSArchitecture os, EditorPluginCPUArchitecture architecture)
            {
                switch (architecture)
                {
                    case EditorPluginCPUArchitecture.x86_64:
                        return os == EditorPluginOSArchitecture.OSX ? "Intel 64-bit" : "x64";

                    case EditorPluginCPUArchitecture.ARM64:
                        return os == EditorPluginOSArchitecture.OSX ? "Apple silicon" : "Arm64";

                    case EditorPluginCPUArchitecture.AnyCPU:
                        return "Any CPU";

                    default:
                        throw new NotSupportedException("Unknown EditorPluginCPUArchitecture value: " + architecture);
                }
            }
        }

        private CPUProperty editorCPUProperty;
        private EditorProperty editorOSProperty;

        public EditorPluginImporterExtension() : base(null)
        {
            editorCPUProperty = new CPUProperty(EditorGUIUtility.TrTextContent("CPU", "The processor architectiure that this plugin is compatible with"), "CPU", EditorPluginCPUArchitecture.AnyCPU, (Enum e) => CanSelectArch(e));
            editorOSProperty = new EditorProperty(EditorGUIUtility.TrTextContent("OS", "The Editor operating system that this plugin is compatible with"), "OS", EditorPluginOSArchitecture.AnyOS);

            properties = new Property[] { editorOSProperty, editorCPUProperty };
        }

        public override void OnPlatformSettingsGUI(PluginImporterInspector inspector)
        {
            EditorGUI.BeginChangeCheck();

View on GitHub (pinned to 225b0fbdb5)

Solutions

1. Reimport the editor plugin so its architecture is re-detected for the current host.
2. Reset the OS/CPU compatibility in the plugin inspector to AnyCPU and reapply.
3. Upgrade/downgrade to match the Unity version that produced the asset.
4. In a fork, extend the switch to cover the additional enum member.

Example fix

// before: unknown EditorPluginCPUArchitecture -> default throws

// after
imp.SetPlatformData("Editor", "CPU", nameof(EditorPluginCPUArchitecture.AnyCPU));

if (!Enum.IsDefined(typeof(EditorPluginCPUArchitecture), architecture))
    architecture = EditorPluginCPUArchitecture.AnyCPU;

static bool IsKnown(EditorPluginCPUArchitecture a) =>
    a == EditorPluginCPUArchitecture.x86_64 || a == EditorPluginCPUArchitecture.ARM64 ||
    a == EditorPluginCPUArchitecture.AnyCPU;

When it happens

Trigger: An EditorPluginCPUArchitecture value outside {x86_64, ARM64, AnyCPU} is deserialized or passed into the CPU label resolver — e.g. a value from a different/newer Unity or a corrupted serialized state.

Common situations: Opening a project on an editor whose host-architecture enum differs (e.g. a build that dropped x86 support). Stale serialized editor-plugin compatibility data after an upgrade.

Related errors

• Unknown DesktopPluginCPUArchitecture value: {architecture}
• Unknown opt out decision type
• Unknown dialog icon type
• Parameter enumValue must be of type System.Enum
• Value for parameter atlases is null

AI-assisted analysis of Unity-Technologies/UnityCsReference@225b0fbdb5 (2026-08-13). Data as JSON: /api/errors/2c6288ed458cb884. Report an issue: GitHub.