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Knowledge Base

Unable to access PHP Composer: Your requirements could not be resolved to an installable set of packages

 
applications extensionscomposerdomainsextensionshttps

Symptoms

  • In an attempt to access Plesk > Domains > example.com > PHP Composer the error below is  shown:

    Your requirements could not be resolved to an installable set of packages.
    Problem 1
    - Root composer.json requires plesk/composer-command-info ~1.0.2 -> satisfiable by plesk/composer-command-info[1.0.2].
    - plesk/composer-command-info 1.0.2 requires composer-plugin-api ^1.1 -> found composer-plugin-api[2.0.0] but it does not match your constraint.

  • The composer was unexpectedly updated to 2.0 version:

    # composer --version
    Composer version 2.0-dev

Cause

This is a Composer extension bug with the ID #EXTPHPCOMP-122.

Fixed in:

  • PHP Composer 1.1.0.

Resolution

Please consider updating your server:

  • How to update Plesk extensions

Workaround

If update is not possible for some reason you may try the following

workaround

As a workaround downgrade composer to 1.10.1 version by applying the steps below:

  1. Log into the server via SSH.

  2. Add in /usr/local/psa/admin/conf/panel.ini, the next text:

    [composer]
    downloadUrl = https://getcomposer.org/composer-stable.phar

    Note: If there's already an existing [composer] section, do not add again the tag [composer] but add the downloadUrl right under the existing section.

  3. Execute:

    # plesk daily ComposerSelfUpdate

  4. Verify the composer version:

    # composer --version

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