An error occurred when executing the "'cache:clear --no-warmup'" command

Question

[RuntimeException]                                                         
An error occurred when executing the "'cache:clear --no-warmup'" command. 

i like to upgrade my symfony2.0 project to symfony 2.3 .

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

i followed above one to upgrade my project .But i'm facing following errors

[RuntimeException]                                                         
An error occurred when executing the "'cache:clear --no-warmup'" command.  

Answer 1

run sudo php composer.phar update --no-scripts