What causes "No Clip Vision Model Selected" in LykosAI/StabilityMatrix?

Select a CLIP Vision model (e.g. clip_vision_h.safetensors) in the Wan model card before generating i2v workflows.

LykosAI/StabilityMatrix · error · ValidationException

No Clip Vision Model Selected

Error message

No Clip Vision Model Selected

What it means

The Wan workflow (image-to-video path) also requires a CLIP Vision model for image conditioning. If SelectedClipVisionModel is null, its RelativePath projection is null and the builder throws 'No Clip Vision Model Selected' rather than creating a CLIPVisionLoader with an empty name. This keeps incomplete graphs from being submitted to ComfyUI.

Solutions

Select a CLIP Vision model (e.g. clip_vision_h.safetensors) in the Wan model card before generating i2v workflows.
Download/place the CLIP Vision file in the shared clip_vision folder and refresh the model list.
Re-open the workflow, re-pick the clip vision model, and save so the path persists.

Example fix

// before
ClipName = SelectedClipVisionModel?.RelativePath
           ?? throw new ValidationException("No Clip Vision Model Selected"),
// after
if (SelectedClipVisionModel is null)
    throw new ValidationException("No Clip Vision Model Selected");
// then: ClipName = SelectedClipVisionModel.RelativePath

Defensive patterns

Strategy: validation

Validate before calling

if (card.SelectedClipVisionModel is null)
    throw new ValidationException("No Clip Vision Model Selected");

Type guard

bool HasClipVision(WanModelCardViewModel c) => c.SelectedClipVisionModel != null && !string.IsNullOrEmpty(c.SelectedClipVisionModel.RelativePath);

Try / catch

try { card.ApplyStep(e); }
catch (ValidationException ex) when (ex.Message == "No Clip Vision Model Selected")
{ /* prompt user to choose a clip vision model */ }

Prevention

Show the clip-vision dropdown only for i2v workflows but enforce it there
Ship guidance on which clip_vision file pairs with Wan models
Verify the clip_vision folder is indexed before enabling generate
Re-validate all saved selections on workflow open

When it happens

Trigger: Generating a Wan image-to-video workflow without selecting a CLIP Vision model in the card's clip-vision dropdown, hitting WanModelCardViewModel.cs:262.

Common situations: User selected the text encoder but missed the separate clip_vision dropdown; the clip_vision file (e.g. clip_vision_h) is missing from the shared clip_vision folder; a saved workflow's clip-vision path no longer resolves after file reorganization.

Understand the failure class

Background: "Must pass :limit option" / "Missing required option" — required option errors explained — this error's family across 41 libraries.

Related errors

AI-assisted analysis of LykosAI/StabilityMatrix@af93d6ef57 (2026-09-12). Data as JSON: /api/errors/8f7527ba3781e309. Report an issue: GitHub.

Appendix: source

Thrown at StabilityMatrix.Avalonia/ViewModels/Inference/WanModelCardViewModel.cs:262

        );
        e.Builder.Connections.Base.VAE = vaeLoader.Output;
        e.Builder.Connections.PrimaryVAE = vaeLoader.Output;

        if (ExtraNetworksStackCardViewModel.Cards.OfType<LoraModule>().Any(x => x.IsEnabled))
        {
            ExtraNetworksStackCardViewModel.ApplyStep(e);
        }

        if (!IsClipVisionEnabled)
            return;

        var clipVisionLoader = e.Nodes.AddTypedNode(
            new ComfyNodeBuilder.CLIPVisionLoader
            {
                Name = e.Nodes.GetUniqueName(nameof(ComfyNodeBuilder.CLIPVisionLoader)),
                ClipName =
                    SelectedClipVisionModel?.RelativePath
                    ?? throw new ValidationException("No Clip Vision Model Selected"),
            }
        );

        e.Builder.Connections.BaseClipVision = clipVisionLoader.Output;
        e.Builder.Connections.Base.ClipVision = clipVisionLoader.Output;
    }

    public void LoadStateFromParameters(GenerationParameters parameters)
    {
        if (parameters.ModelName is not { } paramsModelName)
            return;

        var currentModels = ClientManager.UnetModels;

        HybridModelFile? model;

        // First try hash match
        if (parameters.ModelHash is not null)

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