Error when installing

[Kirill Devope]

Your requirements could not be resolved to an installable set of packages.

  Problem 1
    - Root composer.json requires janu-software/facebook-php-sdk ^0.1.4 -> satisfiable by janu-software/facebook-php-sdk[v0.1.4].
    - janu-software/facebook-php-sdk v0.1.4 requires php-http/client-implementation ^1.0 -> could not be found in any version, but the following packages provide it:
      - symfony/http-client Provides powerful methods to fetch HTTP resources synchronously or asynchronously
      - php-http/guzzle6-adapter Guzzle 6 HTTP Adapter
      - symfony/symfony The Symfony PHP framework
      - php-http/curl-client PSR-18 and HTTPlug Async client with cURL
      - php-http/guzzle7-adapter Guzzle 7 HTTP Adapter
      - kriswallsmith/buzz Lightweight HTTP client
      - php-http/mock-client Mock HTTP client
      - php-http/socket-client Socket client for PHP-HTTP
      - php-http/guzzle5-adapter Guzzle 5 HTTP Adapter
      - php-http/react-adapter React HTTP Adapter
      - voku/httpful A Readable, Chainable, REST friendly, PHP HTTP Client
      - php-http/buzz-adapter Buzz HTTP Adapter
      - php-http/cakephp-adapter Cake adapter for PHP-HTTP
      - windwalker/http Windwalker Http package
      - code-tool/curl-client cURL client
      - jorge-matricali/http-client A wrapper of libcurl that implements PSR-7 HTTP message interface.
      - phpgt/fetch Asynchronous HTTP client with promises for PHP 7 applications.
      - windwalker/framework The next generation PHP framework.
      - swisnl/php-http-fixture-client Fixture client for PHP-HTTP
      - betalabs/guzzle6-adapter Guzzle 6 HTTP Adapter
      ... and 33 more.
      Consider requiring one of these to satisfy the php-http/client-implementation requirement.

Potential causes:
 - A typo in the package name
 - The package is not available in a stable-enough version according to your minimum-stability setting
   see <https://getcomposer.org/doc/04-schema.md#minimum-stability> for more details.
 - It's a private package and you forgot to add a custom repository to find it

Read <https://getcomposer.org/doc/articles/troubleshooting.md> for further common problems.
You can also try re-running composer require with an explicit version constraint, e.g. "composer require janu-software/facebook-php-sdk:*" to figure out if any version is installable, or "composer require janu-software/facebook-php-sdk:^2.1" if you know which you need.

[Kirill Devope]

How I solved this

composer require symfony/http-client
composer janu-software/facebook-php-sdk

[Stanislav Janů]

This SDK allows you to use the package you like.