Not able to register chatRoutes with ExpressJs Adapter

//src/mastra/index.ts
export const mastra = new Mastra({
  agents: { weatherAgent, productionDbAgent },
  workflows: { weatherWorkflow },
  logger: new PinoLogger({
    name: "Mastra",
    level: "info",
  }),
  storage: new PostgresStore({
    id: "mastra-global-storage",
    connectionString: process.env.DATABASE_URL,
  }),
  observability: new Observability({
    default: { enabled: true },
  }),
  server: {
    apiRoutes: [
      chatRoute({
        path: "/chat/production-db-agent",
        agent: "production-db-agent",
      }),
    ],
  },
});

//mastra-server-config.ts
export async function initializeMastraServer(
  app: express.Application,
  mastra: Mastra
): Promise<void> {
  const mastraServer = new MastraServer({ app, mastra, prefix: "/mastra" });
  mastraServer.registerContextMiddleware();
  app.use("/mastra", createMastraContextMiddleware);
  mastraServer.registerAuthMiddleware();
  try {
    await mastraServer.registerRoutes();
    logger.info("Mastra server initialized with manual middleware");
  } catch (error) {
    logger.error({ error }, "Error initializing Mastra server");
    throw error;
  }
}

//index.ts file
initializeMastraServer(app, mastra).catch((error) => {
  logger.error({ error }, "Failed to initialize Mastra server");
});