fatal error solved

[Presta.shop]

hello the web show this error and the page appear in "maintenance" by himself

I dontT KNOW how but is solved

[error] PHP Fatal error:  require(): Failed opening required '/var/www/vhosts/41/217566/webspace/siteapps/Prestashop-235614/htdocs/vendor/composer/../symfony/polyfill-ctype/bootstrap.php' (include_path='/var/www/vhosts/41/217566/webspace/siteapps/Prestashop-235614/htdocs/vendor/pear/pear_exception:/var/www/vhosts/41/217566/webspace/siteapps/Prestashop-235614/htdocs/vendor/pear/console_getopt:/var/www/vhosts/41/217566/webspace/siteapps/Prestashop-235614/htdocs/vendor/pear/pear-core-minimal/src:/var/www/vhosts/41/217566/webspace/siteapps/Prestashop-235614/htdocs/vendor/pear/archive_tar:.:/php/includes:/usr/share/pear') in /var/www/vhosts/41/217566/webspace/siteapps/Prestashop-235614/htdocs/vendor/composer/aut

Edited November 4, 2018 by mikel (see edit history)