symfony - Symfony2: __toString() must not throw an exception -

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i deploying symfony2 application, getting following error:

fatalerrorexception in classes.php line 0: error: method symfony\component\httpfoundation\request::__tostring() must not throw exception

apache more descriptive, stating monolog:

 php fatal error:  method symfony\\component\\httpfoundation\\request::__tostring() must not throw exception in /my/path/vendor/monolog/monolog/src/monolog/formatter/normalizerformatter.php on line 0

it thing not clear me how happening. dev-environment on local machine running fine.

i have tried clear prod cache, composer cache , restarted apache service. did fresh "composer install" after clearing cache.

anyone has idea how can solved? running symfony v2.7.4.


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