类'Psr\Log\LogLevel'未在错误中找到andler.php

Question

使用composer update或composer install获取此错误：

Loading composer repositories with package information
Installing dependencies (including require-dev) from lock file
Nothing to install or update
Generating autoload files
> Incenteev\ParameterHandler\ScriptHandler::buildParameters
Updating the "app/config/parameters.yml" file
> Sensio\Bundle\DistributionBundle\Composer\ScriptHandler::buildBootstrap
> Sensio\Bundle\DistributionBundle\Composer\ScriptHandler::clearCache
PHP Fatal error:  Class 'Psr\Log\LogLevel' not found in /var/www/html/Project/MRA/vendor/symfony/symfony/src/Symfony/Component/Debug/ErrorHandler.php on line 121
Script Sensio\Bundle\DistributionBundle\Composer\ScriptHandler::clearCache handling the post-install-cmd event terminated with an exception



  [RuntimeException]                                                                                                                                             
  An error occurred when executing the "'cache:clear --no-warmup'" command:                                                                                      
  PHP Fatal error:  Class 'Psr\Log\LogLevel' not found in /var/www/html/Project/MRA/vendor/symfony/symfony/src/Symfony/Component/Debug/ErrorHandler.php on line  
   121                                                                                                                                                           
  .                                                                                                                                                              



install [--prefer-source] [--prefer-dist] [--dry-run] [--dev] [--no-dev] [--no-plugins] [--no-custom-installers] [--no-autoloader] [--no-scripts] [--no-progress] [-v|vv|vvv|--verbose] [-o|--optimize-autoloader] [-a|--classmap-authoritative] [--ignore-platform-reqs] [--] [<packages>]...

我正在使用symfony 2.7.7，这是我的composer.json：

• “php”：

Answer 1

好的，PSR记录器不在composer.json中，所以我在composer.json中添加了“PSR/log”：“dev master”，并修复了错误。PS：不知道为什么它突然不工作，只是因为它没有安装！