安装friendsofsymfony / user-bundle时出错

Question

While installing the friends of Symfony user bundle, I came across this error. Can someone help me solve this issue?

Ahmeds-MBP:placementlink2 ahmed$ composer require friendsofsymfony/user-bundle 
Using version ^2.1 for friendsofsymfony/user-bundle 
./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 
- Conclusion: don't install friendsofsymfony/user-bundle v2.1.2 
- Conclusion: don't install friendsofsymfony/user-bundle v2.1.1 
- Conclusion: don't install twig/twig v2.5.0 
- Conclusion: remove twig/twig v1.23.1 
- Conclusion: don't install twig/twig v2.4.8 
- Installation request for friendsofsymfony/user-bundle ^2.1 -> satisfiable by friendsofsymfony/user-bundle[v2.1.0, v2.1.1, v2.1.2]. 
- Conclusion: don't install twig/twig v1.23.1 
- friendsofsymfony/user-bundle v2.1.0 requires twig/twig ^1.28 || ^2.0 -> satisfiable by twig/twig[v1.28.0, v1.28.1, v1.28.2, v1.29.0, v1.30.0, v1.31.0, v1.32.0, v1.33.0, v1.33.1, v1.33.2, v1.34.0, v1.34.1, v1.34.2, v1.34.3, v1.34.4, v1.35.0, v1.35.1, v1.35.2, v1.35.3, v1.35.4, v2.0.0, v2.1.0, v2.2.0, v2.3.0, v2.3.1, v2.3.2, v2.4.0, v2.4.1, v2.4.2, v2.4.3, v2.4.4, v2.4.5, v2.4.6, v2.4.7, v2.4.8, v2.5.0]. 
- Can only install one of: twig/twig[v1.28.0, v1.23.1]. 
- Can only install one of: twig/twig[v1.28.1, v1.23.1]. 
- Can only install one of: twig/twig[v1.28.2, v1.23.1]. 
- Can only install one of: twig/twig[v1.29.0, v1.23.1]. 
- Can only install one of: twig/twig[v1.30.0, v1.23.1]. 
- Can only install one of: twig/twig[v1.31.0, v1.23.1]. 
- Can only install one of: twig/twig[v1.32.0, v1.23.1]. 
- Can only install one of: twig/twig[v1.33.0, v1.23.1]. 
- Can only install one of: twig/twig[v1.33.1, v1.23.1]. 
- Can only install one of: twig/twig[v1.33.2, v1.23.1]. 
- Can only install one of: twig/twig[v1.34.0, v1.23.1]. 
- Can only install one of: twig/twig[v1.34.1, v1.23.1]. 
- Can only install one of: twig/twig[v1.34.2, v1.23.1]. 
- Can only install one of: twig/twig[v1.34.3, v1.23.1]. 
- Can only install one of: twig/twig[v1.34.4, v1.23.1]. 
- Can only install one of: twig/twig[v1.35.0, v1.23.1]. 
- Can only install one of: twig/twig[v1.35.1, v1.23.1]. 
- Can only install one of: twig/twig[v1.35.2, v1.23.1]. 
- Can only install one of: twig/twig[v1.35.3, v1.23.1]. 
- Can only install one of: twig/twig[v1.35.4, v1.23.1]. 
- Can only install one of: twig/twig[v2.0.0, v1.23.1]. 
- Can only install one of: twig/twig[v2.1.0, v1.23.1]. 
- Can only install one of: twig/twig[v2.2.0, v1.23.1]. 
- Can only install one of: twig/twig[v2.3.0, v1.23.1]. 
- Can only install one of: twig/twig[v2.3.1, v1.23.1]. 
- Can only install one of: twig/twig[v2.3.2, v1.23.1]. 
- Can only install one of: twig/twig[v2.4.0, v1.23.1]. 
- Can only install one of: twig/twig[v2.4.1, v1.23.1]. 
- Can only install one of: twig/twig[v2.4.2, v1.23.1]. 
- Can only install one of: twig/twig[v2.4.3, v1.23.1]. 
- Can only install one of: twig/twig[v2.4.4, v1.23.1]. 
- Can only install one of: twig/twig[v2.4.5, v1.23.1]. 
- Can only install one of: twig/twig[v2.4.6, v1.23.1]. 
- Can only install one of: twig/twig[v2.4.7, v1.23.1]. 
- Installation request for twig/twig (locked at v1.23.1) -> satisfiable by twig/twig[v1.23.1].

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

and this is my composer.json file:

"require":{  
  "php":">=5.5.9",
  "symfony/symfony":"3.0.*",
  "doctrine/orm":"^2.5",
  "doctrine/doctrine-bundle":"^1.6",
  "doctrine/doctrine-cache-bundle":"^1.2",
  "symfony/swiftmailer-bundle":"^2.3",
  "symfony/monolog-bundle":"^2.8",
  "sensio/distribution-bundle":"^5.0",
  "sensio/framework-extra-bundle":"^3.0.2",
  "incenteev/composer-parameter-handler":"^2.0"
},
"require-dev":{  
  "sensio/generator-bundle":"^3.0",
  "symfony/phpunit-bridge":"^2.7"
},

Answer 1

I did a little of googling for the issue that you mentioned above and there seems to be is a bugfix for it. Unfortunately, as far as I understood, the fix was not ported to 3.0 release as, at the time of the bug, 3.0 was no longer maintained:

Fabien Potencier (fabpot) commented on Oct 23, 2016

Oh, I see that you are using Symfony 3.0 . It won't work unfortunately as 3.0 is not maintained anymore. You need to either upgrade to 3.1 or use Twig 1.x .

Please proceed as Fabien suggested and you should probably get rid of an issue.

Hope this helps...