keras-team/keras · error · ValueError

Was asked to retrieve layer at index {index} but model only

Error message

Was asked to retrieve layer at index {index} but model only has {len(self.layers)} layers.

What it means

Error "Was asked to retrieve layer at index {index} but model only has {len(self.layers)} layers." thrown in keras-team/keras.

Source

Thrown at keras/src/models/model.py:206

        If `name` and `index` are both provided, `index` will take precedence.
        Indices are based on order of horizontal graph traversal (bottom-up).

        Args:
            name: String, name of layer.
            index: Integer, index of layer.

        Returns:
            A layer instance.
        """
        if index is not None and name is not None:
            raise ValueError(
                "Provide only a layer name or a layer index. Received: "
                f"index={index}, name={name}."
            )
        if index is not None:
            if len(self.layers) <= index:
                raise ValueError(
                    f"Was asked to retrieve layer at index {index}"
                    f" but model only has {len(self.layers)}"
                    " layers."
                )
            else:
                return self.layers[index]

        if name is not None:
            for layer in self.layers:
                if layer.name == name:
                    return layer
            raise ValueError(
                f"No such layer: {name}. Existing layers are: "
                f"{list(layer.name for layer in self.layers)}."
            )
        raise ValueError(
            "Provide either a layer name or layer index at `get_layer`."
        )

View on GitHub (pinned to 7a34a03db6)

When it happens

Trigger: Thrown at keras/src/models/model.py:206 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of keras-team/keras@7a34a03db6 (2026-08-25). Data as JSON: /api/errors/9b1295e858226020. Report an issue: GitHub.