Install fails with Laravel 5.4, PHP 7.1

[dandarie]

Install fails on a fresh Laravel 5.4 app:

$ composer create-project --prefer-dist laravel/laravel blog
$ composer require forestadmin/forest-laravel
Using version ^0.1.1 for forestadmin/forest-laravel
./composer.json has been updated
Loading composer repositories with package information
Updating dependencies (including require-dev)
Your requirements could not be resolved to an installable set of packages.

  Problem 1
    - doctrine/instantiator 1.0.1 requires php ~5.3 -> your PHP version (7.1.8) does not satisfy that requirement.
    - doctrine/instantiator 1.0.3 requires php ~5.3 -> your PHP version (7.1.8) does not satisfy that requirement.
    - doctrine/instantiator 1.0.2 requires php ~5.3 -> your PHP version (7.1.8) does not satisfy that requirement.
    - Conclusion: remove symfony/console v3.3.7
    - Conclusion: don't install symfony/console v3.3.7
    - doctrine/orm v2.5.0 requires symfony/console ~2.5 -> satisfiable by symfony/console[v2.5.0, v2.5.1, v2.5.10, v2.5.11, v2.5.12, v2.5.2, v2.5.3, v2.5.4, v2.5.5, v2.5.6, v2.5.7, v2.5.8, v2.5.9, v2.6.0, v2.6.1, v2.6.10, v2.6.11, v2.6.12, v2.6.13, v2.6.2, v2.6.3, v2.6.4, v2.6.5, v2.6.6, v2.6.7, v2.6.8, v2.6.9, v2.7.0, v2.7.1, v2.7.10, v2.7.11, v2.7.12, v2.7.13, v2.7.14, v2.7.15, v2.7.16, v2.7.17, v2.7.18, v2.7.19, v2.7.2, v2.7.20, v2.7.21, v2.7.22, v2.7.23, v2.7.24, v2.7.25, v2.7.26, v2.7.27, v2.7.28, v2.7.29, v2.7.3, v2.7.30, v2.7.31, v2.7.32, v2.7.33, v2.7.34, v2.7.4, v2.7.5, v2.7.6, v2.7.7, v2.7.8, v2.7.9, v2.8.0, v2.8.1, v2.8.10, v2.8.11, v2.8.12, v2.8.13, v2.8.14, v2.8.15, v2.8.16, v2.8.17, v2.8.18, v2.8.19, v2.8.2, v2.8.20, v2.8.21, v2.8.22, v2.8.23, v2.8.24, v2.8.25, v2.8.26, v2.8.27, v2.8.3, v2.8.4, v2.8.5, v2.8.6, v2.8.7, v2.8.8, v2.8.9].
    - doctrine/orm v2.5.1 requires symfony/console ~2.5 -> satisfiable by symfony/console[v2.5.0, v2.5.1, v2.5.10, v2.5.11, v2.5.12, v2.5.2, v2.5.3, v2.5.4, v2.5.5, v2.5.6, v2.5.7, v2.5.8, v2.5.9, v2.6.0, v2.6.1, v2.6.10, v2.6.11, v2.6.12, v2.6.13, v2.6.2, v2.6.3, v2.6.4, v2.6.5, v2.6.6, v2.6.7, v2.6.8, v2.6.9, v2.7.0, v2.7.1, v2.7.10, v2.7.11, v2.7.12, v2.7.13, v2.7.14, v2.7.15, v2.7.16, v2.7.17, v2.7.18, v2.7.19, v2.7.2, v2.7.20, v2.7.21, v2.7.22, v2.7.23, v2.7.24, v2.7.25, v2.7.26, v2.7.27, v2.7.28, v2.7.29, v2.7.3, v2.7.30, v2.7.31, v2.7.32, v2.7.33, v2.7.34, v2.7.4, v2.7.5, v2.7.6, v2.7.7, v2.7.8, v2.7.9, v2.8.0, v2.8.1, v2.8.10, v2.8.11, v2.8.12, v2.8.13, v2.8.14, v2.8.15, v2.8.16, v2.8.17, v2.8.18, v2.8.19, v2.8.2, v2.8.20, v2.8.21, v2.8.22, v2.8.23, v2.8.24, v2.8.25, v2.8.26, v2.8.27, v2.8.3, v2.8.4, v2.8.5, v2.8.6, v2.8.7, v2.8.8, v2.8.9].
    - Can only install one of: symfony/console[v2.5.0, v3.3.7].
    - Can only install one of: symfony/console[v2.5.1, v3.3.7].
    - Can only install one of: symfony/console[v2.5.10, v3.3.7].
    - Can only install one of: symfony/console[v2.5.11, v3.3.7].
    - Can only install one of: symfony/console[v2.5.12, v3.3.7].
    - Can only install one of: symfony/console[v2.5.2, v3.3.7].
    - Can only install one of: symfony/console[v2.5.3, v3.3.7].
    - Can only install one of: symfony/console[v2.5.4, v3.3.7].
    - Can only install one of: symfony/console[v2.5.5, v3.3.7].
    - Can only install one of: symfony/console[v2.5.6, v3.3.7].
    - Can only install one of: symfony/console[v2.5.7, v3.3.7].
    - Can only install one of: symfony/console[v2.5.8, v3.3.7].
    - Can only install one of: symfony/console[v2.5.9, v3.3.7].
    - Can only install one of: symfony/console[v2.6.0, v3.3.7].
    - Can only install one of: symfony/console[v2.6.1, v3.3.7].
    - Can only install one of: symfony/console[v2.6.10, v3.3.7].
    - Can only install one of: symfony/console[v2.6.11, v3.3.7].
    - Can only install one of: symfony/console[v2.6.12, v3.3.7].
    - Can only install one of: symfony/console[v2.6.13, v3.3.7].
    - Can only install one of: symfony/console[v2.6.2, v3.3.7].
    - Can only install one of: symfony/console[v2.6.3, v3.3.7].
    - Can only install one of: symfony/console[v2.6.4, v3.3.7].
    - Can only install one of: symfony/console[v2.6.5, v3.3.7].
    - Can only install one of: symfony/console[v2.6.6, v3.3.7].
    - Can only install one of: symfony/console[v2.6.7, v3.3.7].
    - Can only install one of: symfony/console[v2.6.8, v3.3.7].
    - Can only install one of: symfony/console[v2.6.9, v3.3.7].
    - Can only install one of: symfony/console[v2.7.0, v3.3.7].
    - Can only install one of: symfony/console[v2.7.1, v3.3.7].
    - Can only install one of: symfony/console[v2.7.10, v3.3.7].
    - Can only install one of: symfony/console[v2.7.11, v3.3.7].
    - Can only install one of: symfony/console[v2.7.12, v3.3.7].
    - Can only install one of: symfony/console[v2.7.13, v3.3.7].
    - Can only install one of: symfony/console[v2.7.14, v3.3.7].
    - Can only install one of: symfony/console[v2.7.15, v3.3.7].
    - Can only install one of: symfony/console[v2.7.16, v3.3.7].
    - Can only install one of: symfony/console[v2.7.17, v3.3.7].
    - Can only install one of: symfony/console[v2.7.18, v3.3.7].
    - Can only install one of: symfony/console[v2.7.19, v3.3.7].
    - Can only install one of: symfony/console[v2.7.2, v3.3.7].
    - Can only install one of: symfony/console[v2.7.20, v3.3.7].
    - Can only install one of: symfony/console[v2.7.21, v3.3.7].
    - Can only install one of: symfony/console[v2.7.22, v3.3.7].
    - Can only install one of: symfony/console[v2.7.23, v3.3.7].
    - Can only install one of: symfony/console[v2.7.24, v3.3.7].
    - Can only install one of: symfony/console[v2.7.25, v3.3.7].
    - Can only install one of: symfony/console[v2.7.26, v3.3.7].
    - Can only install one of: symfony/console[v2.7.27, v3.3.7].
    - Can only install one of: symfony/console[v2.7.28, v3.3.7].
    - Can only install one of: symfony/console[v2.7.29, v3.3.7].
    - Can only install one of: symfony/console[v2.7.3, v3.3.7].
    - Can only install one of: symfony/console[v2.7.30, v3.3.7].
    - Can only install one of: symfony/console[v2.7.31, v3.3.7].
    - Can only install one of: symfony/console[v2.7.32, v3.3.7].
    - Can only install one of: symfony/console[v2.7.33, v3.3.7].
    - Can only install one of: symfony/console[v2.7.34, v3.3.7].
    - Can only install one of: symfony/console[v2.7.4, v3.3.7].
    - Can only install one of: symfony/console[v2.7.5, v3.3.7].
    - Can only install one of: symfony/console[v2.7.6, v3.3.7].
    - Can only install one of: symfony/console[v2.7.7, v3.3.7].
    - Can only install one of: symfony/console[v2.7.8, v3.3.7].
    - Can only install one of: symfony/console[v2.7.9, v3.3.7].
    - Can only install one of: symfony/console[v2.8.0, v3.3.7].
    - Can only install one of: symfony/console[v2.8.1, v3.3.7].
    - Can only install one of: symfony/console[v2.8.10, v3.3.7].
    - Can only install one of: symfony/console[v2.8.11, v3.3.7].
    - Can only install one of: symfony/console[v2.8.12, v3.3.7].
    - Can only install one of: symfony/console[v2.8.13, v3.3.7].
    - Can only install one of: symfony/console[v2.8.14, v3.3.7].
    - Can only install one of: symfony/console[v2.8.15, v3.3.7].
    - Can only install one of: symfony/console[v2.8.16, v3.3.7].
    - Can only install one of: symfony/console[v2.8.17, v3.3.7].
    - Can only install one of: symfony/console[v2.8.18, v3.3.7].
    - Can only install one of: symfony/console[v2.8.19, v3.3.7].
    - Can only install one of: symfony/console[v2.8.2, v3.3.7].
    - Can only install one of: symfony/console[v2.8.20, v3.3.7].
    - Can only install one of: symfony/console[v2.8.21, v3.3.7].
    - Can only install one of: symfony/console[v2.8.22, v3.3.7].
    - Can only install one of: symfony/console[v2.8.23, v3.3.7].
    - Can only install one of: symfony/console[v2.8.24, v3.3.7].
    - Can only install one of: symfony/console[v2.8.25, v3.3.7].
    - Can only install one of: symfony/console[v2.8.26, v3.3.7].
    - Can only install one of: symfony/console[v2.8.27, v3.3.7].
    - Can only install one of: symfony/console[v2.8.3, v3.3.7].
    - Can only install one of: symfony/console[v2.8.4, v3.3.7].
    - Can only install one of: symfony/console[v2.8.5, v3.3.7].
    - Can only install one of: symfony/console[v2.8.6, v3.3.7].
    - Can only install one of: symfony/console[v2.8.7, v3.3.7].
    - Can only install one of: symfony/console[v2.8.8, v3.3.7].
    - Can only install one of: symfony/console[v2.8.9, v3.3.7].
    - Installation request for symfony/console (locked at v3.3.7) -> satisfiable by symfony/console[v3.3.7].
    - Installation request for forestadmin/forest-laravel ^0.1.1 -> satisfiable by forestadmin/forest-laravel[0.1.1].
    - Conclusion: don't install doctrine/instantiator 1.1.0|install doctrine/orm v2.5.0|install doctrine/orm v2.5.1
    - Conclusion: remove doctrine/instantiator 1.1.0|install doctrine/orm v2.5.0|install doctrine/orm v2.5.1
    - forestadmin/forest-laravel 0.1.1 requires doctrine/orm ^2.5 -> satisfiable by doctrine/orm[v2.5.0, v2.5.1, v2.5.10, v2.5.2, v2.5.3, v2.5.4, v2.5.5, v2.5.6, v2.5.7, v2.5.8, v2.5.9].
    - doctrine/orm v2.5.9 requires doctrine/instantiator ~1.0.1 -> satisfiable by doctrine/instantiator[1.0.1, 1.0.2, 1.0.3, 1.0.4, 1.0.5].
    - doctrine/orm v2.5.8 requires doctrine/instantiator ~1.0.1 -> satisfiable by doctrine/instantiator[1.0.1, 1.0.2, 1.0.3, 1.0.4, 1.0.5].
    - doctrine/orm v2.5.7 requires doctrine/instantiator ~1.0.1 -> satisfiable by doctrine/instantiator[1.0.1, 1.0.2, 1.0.3, 1.0.4, 1.0.5].
    - doctrine/orm v2.5.6 requires doctrine/instantiator ~1.0.1 -> satisfiable by doctrine/instantiator[1.0.1, 1.0.2, 1.0.3, 1.0.4, 1.0.5].
    - doctrine/orm v2.5.5 requires doctrine/instantiator ~1.0.1 -> satisfiable by doctrine/instantiator[1.0.1, 1.0.2, 1.0.3, 1.0.4, 1.0.5].
    - doctrine/orm v2.5.4 requires doctrine/instantiator ~1.0.1 -> satisfiable by doctrine/instantiator[1.0.1, 1.0.2, 1.0.3, 1.0.4, 1.0.5].
    - doctrine/orm v2.5.3 requires doctrine/instantiator ~1.0.1 -> satisfiable by doctrine/instantiator[1.0.1, 1.0.2, 1.0.3, 1.0.4, 1.0.5].
    - doctrine/orm v2.5.2 requires doctrine/instantiator ~1.0.1 -> satisfiable by doctrine/instantiator[1.0.1, 1.0.2, 1.0.3, 1.0.4, 1.0.5].
    - doctrine/orm v2.5.10 requires doctrine/instantiator ~1.0.1 -> satisfiable by doctrine/instantiator[1.0.1, 1.0.2, 1.0.3, 1.0.4, 1.0.5].
    - Can only install one of: doctrine/instantiator[1.0.4, 1.1.0].
    - Can only install one of: doctrine/instantiator[1.0.5, 1.1.0].
    - Installation request for doctrine/instantiator (locked at 1.1.0) -> satisfiable by doctrine/instantiator[1.1.0].

Installation failed, reverting ./composer.json to its original content.

[arnaudbesnier]

Hi @dandarie,

This issue will be closed as the repository will be archived soon.

The brand new Laravel agent for Forest Admin is available here: https://github.com/ForestAdmin/laravel-forestadmin

As we now have a team of dedicated developers for this new Laravel agent, be sure Forest Admin will provide a much better Laravel support experience compared to the one you had in the past for v1.

Forest Admin also evolved a lot in 4 years as an internal tool platform, don’t hesitate to give it another try, you should not be disappointed 🌲🌲🌲

Best Regards.