Symfony2 vendors install

I'm trying to setup and create new bundle with symfony2, but getting so much error almost every step.

I'm download symfony and run this command;

php bin/vendors install

> Installing/Updating开发者_Go百科 swiftmailer Cloning into /var/www/Symfony/vendor/swiftmailer...

...

...

...

[ErrorException]

Warning: constant(): Couldn't find constant Monolog\Logger::iNFO in /var/www/Symfony/vendor/symfony/src/Symfony/Bundle/MonologBundle/DependencyInjection/MonologExtension.php line 103

what is the problem? what should I do?

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Error reason is Turkish system language. so in Turkish language "i" upper case "İ" and "I" lowercase "ı". I'm change my system language to English and problem solved.

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write handler level uppercased to bypass this code strtoupper($handler['level'])) for example level: INFO

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This sounds very very strange. The MonologExtension uses constant() at one point, and it does it like that:

constant('Monolog\Logger::'.strtoupper($handler['level']))

So basically, it uppercases the given level. Seeing the exception about ::iNFO not being found does not make sense, unless perhaps you have the mbstring extension enabled with the mbstring.func_overload option enabled as well.

Can you check if ini_get('mbstring.func_overload') returns 0/null? Otherwise that may be the cause. I really can't think of anything else.