Error 500 su catalogo e modules

[angelo.abitante]

Ho appena scaricato e installato prestashop e quando da admin provo a cliccare su catalogo e modules mi esce il seguente errore: Compile Error: Symfony\Component\Debug\DebugClassLoader::loadClass(): Failed opening required '/web/htdocs/.../vendor/symfony/symfony/src/Symfony/Component/Security/Http/AccessMapInterface.php' (include_path='/web/htdocs/www.valbimbo.com/home/tools/htmlpurifier/standalone:/web/htdocs/...e/vendor/pear/pear_exception:/web/htdocs/.../vendor/pear/console_getopt:/web/htdocs/.../vendor/pear/pear-core-minimal/src:/web/htdocs/.../vendor/pear/archive_tar:.:/php5.5/lib/php')

 

Sapreste aiutarmi?

 

Saluti a tutti!