fix(Gemini Vertex Node): Upgrading Langchain/google-vertexai to allow errors to bubble up correctly (#19639)

packages/@n8n/nodes-langchain/nodes/llms/LmChatGoogleVertex/LmChatGoogleVertex.node.ts

@@ -88,7 +88,7 @@ export class LmChatGoogleVertex implements INodeType {
 				type: 'string',
 				description:
 					'The model which will generate the completion. <a href="https://cloud.google.com/vertex-ai/generative-ai/docs/learn/models">Learn more</a>.',
-				default: 'gemini-1.5-flash',
+				default: 'gemini-2.5-flash',
 			},
 			additionalOptions,
 		],

packages/@n8n/nodes-langchain/nodes/llms/LmChatGoogleVertex/error-handling.ts

@@ -12,7 +12,7 @@ export function makeErrorFromStatus(statusCode: number, context?: ErrorContext):
 		403: {
 			message: 'Unauthorized for this project',
 			description:
-				'Check your Google Cloud project ID, and that your credential has access to that project',
+				'Check your Google Cloud project ID, that your credential has access to that project and that billing is enabled',
 		},
 		404: {
 			message: context?.modelName

packages/@n8n/nodes-langchain/package.json

@@ -178,7 +178,7 @@
     "@langchain/community": "catalog:",
     "@langchain/core": "catalog:",
     "@langchain/google-genai": "0.2.17",
-    "@langchain/google-vertexai": "0.2.13",
+    "@langchain/google-vertexai": "0.2.18",
     "@langchain/groq": "0.2.3",
     "@langchain/mistralai": "0.2.1",
     "@langchain/mongodb": "^0.1.0",