'The parameter "debug.error_handler.throw_at" must be defined' error after updating to Symfony 2.6
After updating Symfony with Composer to version 2.6 it gives this error:
[Symfony\Component\DependencyInjection\Exception\InvalidArgumentException] The parameter "debug.error_handler.throw_at" must be defined.
manualy clear application cache -
remove all files in /app/cache:
rm -r app/cache/*
and then warmup cache for needed environment like that:
app/console cache:warmup --env=prod