执行"'cache:clear --no-warmup'"命令时发生错误

kov*_*han 9 symfony

[RuntimeException]                                                         
An error occurred when executing the "'cache:clear --no-warmup'" command. 
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我想将我的symfony2.0项目升级到symfony 2.3.

https://github.com/symfony/symfony-standard/blob/v2.3.1/UPGRADE.md

我按照上面的一个来升级我的项目.但是我面临以下错误

[RuntimeException]                                                         
An error occurred when executing the "'cache:clear --no-warmup'" command.  
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Dan*_*ger 12

sudo php composer.phar update --no-scripts