Error after upgrading from 2.1.2 to 3.1.13

Error after upgrading from 2.1.2 to 3.1.13 - Printable Version

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Error after upgrading from 2.1.2 to 3.1.13 - almotawir - 03-02-2023

Hi everyone
after upgrading my app from version 2.1.2 to 3.1.13 i get some errors which don't make sense for exemple this one:

Code:
An uncaught Exception was encountered

Type: Error

Message: Class name must be a valid object or a string

Filename: /Users/mac/www/nephrogest/system/database/DB_result.php

Line Number: 205

my PHP version is 7.4 and i'm using MySQL 8
plz any help