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Editorial Team
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Asked: 2026-06-16T00:39:15+00:00

Composer install command works fine locally on my computer: Loading composer repositories with package

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Composer install command works fine locally on my computer:

  • Loading composer repositories with package information
  • Installing dependencies from lock file
  • Nothing to install or update
  • Generating autoload files

When I connect via ssh to the ubuntu server, and run the same command I get this.

PHP Fatal error:  Class 'Composer\Installers\Installer' not found in phar:///usr/local/bin/composer/src/Composer/Installer/InstallerInstaller.php on line 102

Fatal error: Class 'Composer\Installers\Installer' not found in phar:///usr/local/bin/composer/src/Composer/Installer/InstallerInstaller.php on line 102

I followed the instructions here for both machines:
https://github.com/composer/composer/blob/master/README.md

I am missing some dependencies here? I can’t figure out why that error.

Edit: Here is the .json (project is symfony 1.4, adding tags as well)

{
  "minimum-stability": "dev",
  "require"     : {
    "snappy/sfSnappyPlugin": "*"
  },
  "repositories": [
    {
      "type": "git",
      "url": "https://github.com/FloranBrutel/sfSnappyPlugin.git"
    }
  ]
}

Edit2: The output of the php -v on the AWS server

PHP 5.3.10-1ubuntu3.4 with Suhosin-Patch (cli) (built: Sep 12 2012 18:59:41) 
Copyright (c) 1997-2012 The PHP Group
Zend Engine v2.3.0, Copyright (c) 1998-2012 Zend Technologies

On my machine I have:

PHP 5.3.6-13ubuntu3.9 with Suhosin-Patch (cli) (built: Sep 12 2012 19:00:27) 
Copyright (c) 1997-2011 The PHP Group
Zend Engine v2.3.0, Copyright (c) 1998-2011 Zend Technologies
with Xdebug v2.1.0, Copyright (c) 2002-2010, by Derick Rethans
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1 Answer

  1. Editorial Team

    I have managed to replicate your problem. Within the directory you are running composer, you should have a path like so:

    vendor/composer/installers/src/Composer/Installers

    and within this directory there should exist an Installer.php file. I managed to get the same error you are getting by deleting that one file.

    So I believe a solution would be to simply completely remove your vendor and plugins directories and try running composer install again, forcing the complete re-download of all the vendors in your composer.json. Hope this helps.

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