n8n-io/n8n · error · NodeOperationError

Unsupported model

Error message

Unsupported model

What it means

Error "Unsupported model" thrown in n8n-io/n8n.

Source

Thrown at packages/@n8n/nodes-langchain/nodes/llms/LmChatGoogleVertex/LmChatGoogleVertex.node.ts:253

					throw error;
				}),
			};

			// Add thinkingBudget if specified
			if (options.thinkingBudget !== undefined) {
				modelConfig.thinkingBudget = options.thinkingBudget;
			}

			const model = new ChatVertexAI(modelConfig);

			return {
				response: model,
			};
		} catch (e) {
			// Catch model name validation error from LangChain (https://github.com/langchain-ai/langchainjs/blob/ef201d0ee85ee4049078270a0cfd7a1767e624f8/libs/langchain-google-common/src/utils/common.ts#L124)
			// to show more helpful error message
			if (e?.message?.startsWith('Unable to verify model params')) {
				throw new NodeOperationError(this.getNode(), e as JsonObject, {
					message: 'Unsupported model',
					description: "Only models starting with 'gemini' are supported.",
				});
			}

			// Assume all other exceptions while creating a new ChatVertexAI instance are parameter validation errors
			throw new NodeOperationError(this.getNode(), e as JsonObject, {
				message: 'Invalid options',
				description: e.message,
			});
		}
	}
}

View on GitHub (pinned to 5ac6606e81)

When it happens

Trigger: Thrown at packages/@n8n/nodes-langchain/nodes/llms/LmChatGoogleVertex/LmChatGoogleVertex.node.ts:253 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of n8n-io/n8n@5ac6606e81 (2026-08-12). Data as JSON: /api/errors/b2fd6098dd909b30. Report an issue: GitHub.