Prestashop 1.7.6.1 FatalErrorException

[apweb06]

Hi,

 After a failed update to version 1.7.6.1, I reinstalled the files I had previously backed up.

I now have this message:

 (1/1) FatalErrorException

Compile Error: Symfony\Component\Debug\DebugClassLoader::loadClass(): Failed opening required '/home/brth4338/public_html/vendor/composer/../symfony/symfony/src/Symfony/Component/DependencyInjection/Compiler/CheckExceptionOnInvalidReferenceBehaviorPass.php' (include_path='/home/brth4338/public_html/vendor/pear/pear_exception:/home/brth4338/public_html/vendor/pear/console_getopt:/home/brth4338/public_html/vendor/pear/pear-core-minimal/src:/home/brth4338/public_html/vendor/pear/archive_tar:.:/opt/alt/php71/usr/share/pear')

in DebugClassLoader.php line 156 

Can you help me? 

[ComGrafPL]

Have you changed PHP version for the update? Cache in VAR cleared?

[apweb06]

Thank you for your quick response.

I restored the PHP version 7.1.33 when the site was working.

The cache has been cleared.

Same error message !