Module manager doesn't load anymore in backoffice and error

[JRCFirewalker]

I receive the following error on a test clone of our shop:

PHP Deprecated: Function mcrypt_decrypt() is deprecated in /home2/atwbsgam/clone/classes/Rijndael.php on line 68

PHP Fatal error: Interface 'PrestaShop\PrestaShop\Core\Module\WidgetInterface' not found in /home2/atwbsgam/clone/modules/ps_brandlist/ps_brandlist.php on line 33

PHP Deprecated: Function mcrypt_decrypt() is deprecated in /home2/atwbsgam/clone/classes/Rijndael.php on line 68

 

Prestashop version 1.6.1.14.

PHP version 7.1 (same error also in older versions)

Thank s for your help

 

[Knowband Plugins]

Hi,

Please have a backup of the ps_configuration table and then you need to login to your phpmyadmin and run the SQL query mentioned below:

UPDATE `ps_configuration` SET `value` = '0' WHERE `name` = 'PS_CIPHER_ALGORITHM';

Hopefully it will solve the problem for you, However if any issue occurs please use the ps_configuration backup you have.

[JRCFirewalker]

I've made the change and now a new error arises: [PrestaShop] Fatal error in module file :/home2/atwbsgam/clone/classes/module/Module.php(1361) : eval()'d code:
syntax error, unexpected 'use' (T_USE)

It's the same error received when a module doesn't work. I've tried the debug mode, to block non-native modules and even to delete modules to have access to the module management page, but with no results.