Error calling middleware

export const createContext = ({
  req,
  res,
}: trpcExpress.CreateExpressContextOptions) => ({ prisma, res, req });

const t = initTRPC.context<Context>().create();

export const router = t.router;
export const procedure = t.procedure;

export const middleware = procedure.use(async (opts) => {
  console.log('middleware');
  return opts.next(opts);
});

export const authRouter = router({
  me: middleware.query(async ({ ctx }) => {
    console.log(ctx.req.headers.cookie);
    return { success: true };
  }),
});