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Hello to all
A friend was trying to update his prestashop store site from 1.7.7.1 to the latest version (1.7.8.3) with "1 click upgrade" but now the site is unusable with the following error.

Fatal error: Uncaught Error: Class 'ComposerAutoloaderInit8d981fb0e3c83553e712cea0b1387cd2' not found in /homepages/15/d370206513/htdocs/vendor/autoload.php:7 Stack trace: #0 /homepages/15/d370206513/htdocs/config/autoload.php(26): require_once() #1 /homepages/15/d370206513/htdocs/config/config.inc.php(38): require_once('/homepages/15/d...') #2 /homepages/15/d370206513/htdocs/admin6492/index.php(40): require('/homepages/15/d...') #3 {main} thrown in /homepages/15/d370206513/htdocs/vendor/autoload.php on line 7

He asked me for help, and although I use other CMS but I have never worked with prestashop. I'm seeing where the error comes from (autoload.php) and when I downloaded the Prestashop 1.7.8.3 package I found that the content of the autoload on my friend's website and the one in the package is the same.

We only have access to the website content via ftp (I don't know if it is possible to update Prestashop by replacing files as it is done in wordpress).
The PHP version of the server is 7.3 but easily upgradable to 7.4 (not upgraded before for compatibility with Prestashop version 1.7.7.1 being used until now).

edit: Changed to 7.4 and everything is the same

We have the option to load backups and start the upgrade again from them

Thanks in advance.

Hello to all
A friend was trying to update his prestashop store site from 1.7.7.1 to the latest version (1.7.8.3) with "1 click upgrade" but now the site is unusable with the following error.

Fatal error: Uncaught Error: Class 'ComposerAutoloaderInit8d981fb0e3c83553e712cea0b1387cd2' not found in /homepages/15/d370206513/htdocs/vendor/autoload.php:7 Stack trace: #0 /homepages/15/d370206513/htdocs/config/autoload.php(26): require_once() #1 /homepages/15/d370206513/htdocs/config/config.inc.php(38): require_once('/homepages/15/d...') #2 /homepages/15/d370206513/htdocs/admin6492/index.php(40): require('/homepages/15/d...') #3 {main} thrown in /homepages/15/d370206513/htdocs/vendor/autoload.php on line 7

He asked me for help, and although I use other CMS but I have never worked with prestashop. I'm seeing where the error comes from (autoload.php) and when I downloaded the Prestashop 1.7.8.3 package I found that the content of the autoload on my friend's website and the one in the package is the same.

<?php

// autoload.php @generated by Composer

require_once __DIR__ . '/composer/autoload_real.php';

return ComposerAutoloaderInit8d981fb0e3c83553e712cea0b1387cd2::getLoader();

I don't know if this file should be generated again for the installation of this web site, but I prefer to ask you

We only have access to the website content via ftp (I don't know if it is possible to update Prestashop by replacing files as it is done in wordpress).
The PHP version of the server is 7.3 but easily upgradable to 7.4 (not upgraded before for compatibility with Prestashop version 1.7.7.1 being used until now).

edit: Changed to 7.4 and everything is the same

We have the option to load backups and start the upgrade again from them

Thanks in advance.

Hello to all
A friend was trying to update his prestashop store site from 1.7.7.1 to the latest version (1.7.8.3) with "1 click upgrade" but now the site is unusable with the following error.

Fatal error: Uncaught Error: Class 'ComposerAutoloaderInit8d981fb0e3c83553e712cea0b1387cd2' not found in /homepages/15/d370206513/htdocs/vendor/autoload.php:7 Stack trace: #0 /homepages/15/d370206513/htdocs/config/autoload.php(26): require_once() #1 /homepages/15/d370206513/htdocs/config/config.inc.php(38): require_once('/homepages/15/d...') #2 /homepages/15/d370206513/htdocs/admin6492/index.php(40): require('/homepages/15/d...') #3 {main} thrown in /homepages/15/d370206513/htdocs/vendor/autoload.php on line 7

He asked me for help, and although I use other CMS but I have never worked with prestashop. I'm seeing where the error comes from (autoload.php) and when I downloaded the Prestashop 1.7.8.3 package I found that the content of the autoload on my friend's website and the one in the package is the same.

<?php

// autoload.php @generated by Composer

require_once __DIR__ . '/composer/autoload_real.php';

return ComposerAutoloaderInit8d981fb0e3c83553e712cea0b1387cd2::getLoader();

I don't know if this file should be generated again for the installation of this web site, but I prefer to ask you

We only have access to the website content via ftp (I don't know if it is possible to update Prestashop by replacing files as it is done in wordpress).
The Php version of the server is 7.3 but easily upgradable to 7.4 (not upgraded before for compatibility with Prestashop version 1.7.7.1 being used until now).

We have the option to load backups and start the upgrade again from them

Thanks in advance.

Hello to all
A friend was trying to update his prestashop store site from 1.7.7.1 to the latest version (1.7.8.3) but now the site is unusable with the following error.

Fatal error: Uncaught Error: Class 'ComposerAutoloaderInit8d981fb0e3c83553e712cea0b1387cd2' not found in /homepages/15/d370206513/htdocs/vendor/autoload.php:7 Stack trace: #0 /homepages/15/d370206513/htdocs/config/autoload.php(26): require_once() #1 /homepages/15/d370206513/htdocs/config/config.inc.php(38): require_once('/homepages/15/d...') #2 /homepages/15/d370206513/htdocs/admin6492/index.php(40): require('/homepages/15/d...') #3 {main} thrown in /homepages/15/d370206513/htdocs/vendor/autoload.php on line 7

He asked me for help, and although I use other CMS but I have never worked with prestashop. I'm seeing where the error comes from (autoload.php) and when I downloaded the Prestashop 1.7.8.3 package I found that the content of the autoload on my friend's website and the one in the package is the same.

<?php

// autoload.php @generated by Composer

require_once __DIR__ . '/composer/autoload_real.php';

return ComposerAutoloaderInit8d981fb0e3c83553e712cea0b1387cd2::getLoader();

I don't know if this file should be generated again for the installation of this web site, but I prefer to ask you

We only have access to the website content via ftp (I don't know if it is possible to update Prestashop by replacing files as it is done in wordpress).
The Php version of the server is 7.3 but easily upgradable to 7.4 (not upgraded before for compatibility with Prestashop version 1.7.7.1 being used until now).

We have the option to load backups and start the upgrade again from them

Thanks in advance.