LykosAI/StabilityMatrix · error · ValidationException

No Clip2 Selected

Error message

No Clip2 Selected

What it means

Thrown in UnetModelCardViewModel.ApplyStep when the second CLIP model is not selected. Dual-CLIP architectures (SDXL, Flux) require exactly two text encoders; with SelectedClip2 null the DualCLIPLoader cannot be configured and validation fails.

Solutions

1. Select the second CLIP file (e.g. clip_g.safetensors or t5xxl) in the Clip2 dropdown
2. Download the missing second text encoder via Model Manager
3. Fix the preset so both Clip1 and Clip2 point to installed files

Example fix

// before
await vm.ApplyStep(args); // SelectedClip2 null -> throws
// after
if (vm.SelectedClip2 is null) { throw new ValidationException("Select Clip2 (e.g. clip_g) first"); }
await vm.ApplyStep(args);

if (vm.SelectedClip2 is null)
    throw new ValidationException("Select Clip2 (e.g. clip_g or t5xxl) before generating");

bool hasBothClips = vm.SelectedClip1 is not null && vm.SelectedClip2 is not null;

try { vm.ApplyStep(args); }
catch (ValidationException ex) when (ex.Message == "No Clip2 Selected") { /* prompt second CLIP selection */ }

When it happens

Trigger: ApplyStep executed with SelectedClip2 == null when clipName2 is computed via SelectedClip2?.RelativePath ?? throw.

Common situations: User selected Clip1 but left Clip2 unset (only one text encoder downloaded); switching between model families left the second dropdown empty; preset references a removed Clip2 file.

Understand the failure class

Background: "is required", "must be set", "missing required field": configuration validation errors across open-source libraries — this error's family across 36 libraries.

Related errors

• No Clip1 Selected
• Model not selected
• No VAE Selected
• Model not selected
• No Clip Model Selected

AI-assisted analysis of LykosAI/StabilityMatrix@af93d6ef57 (2026-09-12). Data as JSON: /api/errors/4cc063e1ee711d34. Report an issue: GitHub.

Appendix: source

Thrown at StabilityMatrix.Avalonia/ViewModels/Inference/UnetModelCardViewModel.cs:77

    }

    public void ApplyStep(ModuleApplyStepEventArgs e)
    {
        var checkpointLoader = e.Nodes.AddTypedNode(GetModelLoader(e, SelectedModel!, SelectedDType));
        e.Builder.Connections.Base.Model = checkpointLoader.Output;

        var vaeLoader = e.Nodes.AddTypedNode(
            new ComfyNodeBuilder.VAELoader
            {
                Name = e.Nodes.GetUniqueName(nameof(ComfyNodeBuilder.VAELoader)),
                VaeName = SelectedVae?.RelativePath ?? throw new ValidationException("No VAE Selected"),
            }
        );
        e.Builder.Connections.Base.VAE = vaeLoader.Output;

        // DualCLIPLoader (GGUF variant can also load .safetensors, so any gguf pick routes there)
        var clipName1 = SelectedClip1?.RelativePath ?? throw new ValidationException("No Clip1 Selected");
        var clipName2 = SelectedClip2?.RelativePath ?? throw new ValidationException("No Clip2 Selected");

        e.Builder.Connections.Base.Clip =
            SelectedClip1 is { IsGguf: true } || SelectedClip2 is { IsGguf: true }
                ? e
                    .Nodes.AddTypedNode(
                        new ComfyNodeBuilder.DualCLIPLoaderGGUF
                        {
                            Name = e.Nodes.GetUniqueName(nameof(ComfyNodeBuilder.DualCLIPLoaderGGUF)),
                            ClipName1 = clipName1,
                            ClipName2 = clipName2,
                            Type = "flux",
                        }
                    )
                    .Output
                : e
                    .Nodes.AddTypedNode(
                        new ComfyNodeBuilder.DualCLIPLoader
                        {

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