error symfony 3.0.9 php7 twig cache: clear
[Twig_Error_Runtime]
The "core" extension is not enabled.

Script Sensio \ Bundle \ DistributionBundle \ Composer \ ScriptHandler

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

[Twig_Error_Runtime] The "core" extension is not enabled.

.
This is the error with composer update

    1 answer 1

    rollback to version php 5.6
    php5.6-mysql php5.6-xml php5.6-mbstring delete all caches
    deleting the contents of the vendor folder
    uninstall composer.lock

    composer install
    helped me