I try to build Magento 2.4.5 with php 8.1 docker on premises environment and I followed the process described here https://devdocs.magento.com/cloud/docker/docker-installation.html.

I ended up with error:

Cannot decode string: list indices must be integers or slices, not str ERROR: 1

Below are the exact steps I followed with the exact commands:

  1. Created project using composer

    composer create-project --repository-url=https://repo.magento.com/ magento/project-community-edition=2.4.5 magento-community-edition

  2. Change to directory magento-community-edition

  3. Add the ece-tools and Cloud Docker for Commerce packages.

    composer require --no-update --dev magento/ece-tools magento/magento-cloud-docker

  4. Install ece tools and cloud docker with composer

    compose update

  5. I ran the Docker configuration generator and created docker-compose.yml

    ./vendor/bin/ece-docker build:compose --mode=production --php=8.1 --db=10.3

  6. Created and started containers

    ./bin/magento-docker up

  7. Run build hooks

    ./bin/magento-docker ece-build

At this step after it run installing various composer dependencies if fails with error:

Running "build" hook. Cannot decode string: list indices must be integers or slices, not str ERROR: 1

Any assistance is appreciated.

  • Hi! Did you create the .magento.app.yaml file? Also, you can try to use the template for 2.4.5: github.com/magento/magento-cloud/tree/2.4.5 Templates contain all needed config files.
    – BaDos
    Commented Nov 1, 2022 at 23:20
  • Thanks for the response. I added the .magento.app.yaml file but still same problem. I cannot use above repository because I try the community edition. Commented Nov 8, 2022 at 6:02

1 Answer 1


try these steps:

  • clone needed branch from https://github.com/magento/magento-cloud
  • run composer install
  • run ./vendor/bin/ece-docker build:compose
  • run docker-compose up -d
  • run docker-compose run build cloud-build
  • run docker-compose run deploy cloud-deploy
  • run docker-compose run deploy cloud-post-deploy

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