Matrix and jobs coming from an Orb

Deployments
1

I would like to dynamically set some parameters of the job aws-ecr/build-and-push-images.
For this purpose, I use the matrix feature:

orbs:
  aws-ecr: circleci/aws-ecr@7.2.0
  docker: circleci/docker@1.7.0
version: 2.1
workflows:
  build_docker_images:
    jobs:
    - aws-ecr/build-and-push-image:
        dockerfile: build/Dockerfile
        executor: docker/docker
        matrix:
          parameters:
            package:
            - frontend
            - backend
        name: << matrix.package>>_build_docker_image>
        path: packages/<< matrix.package >>
        remote-docker-layer-caching: true
        repo: test-eks-<< matrix.package >>
        setup-remote-docker: true
        tag: $CIRCLE_SHA1

It’s what has been suggested in this topic.

Sadly, when this configuration is run, I got the following error:


#!/bin/sh -eo pipefail
# Error calling workflow: 'build_docker_images'
# Error calling job: 'aws-ecr/build-and-push-image'
# Unexpected argument(s): package
# 
# -------
# Warning: This configuration was auto-generated to show you the message above.
# Don't rerun this job. Rerunning will have no effect.
false


Exited with code exit status 1

CircleCI received exit code 1

I don’t get why. Any idea where I’m wrong?