Fatal Error in Vanilla\Site\DefaultSiteSection.__construct();

hi so i'm new to Vanilla Forums i just found out about this forums software today and i downloaded a pre-bulit version of Vanilla Forums and the version of it is 2021.012 and i uploaded the pre-built version to my website and after the upload finished and when i went to the forms url it said this:

Something has gone wrong.

and i checked the logs and i found this error:

AH01071: Got error 'PHP message: PHP Fatal error: Uncaught ReflectionException: Class UserModel does not exist in /var/www/vhosts/mysite.com/forums.mysite.com/vendor/vanilla/garden-container/src/Container.php:620\nStack trace:\n#0 /var/www/vhosts/mysite.com/forums.mysite.com/vendor/vanilla/garden-container/src/Container.php(620): ReflectionParameter->getClass()\n#1 /var/www/vhosts/mysite.com/forums.mysite.com/vendor/vanilla/garden-container/src/Container.php(549): Garden\\Container\\Container->makeDefaultArgs()\n#2 /var/www/vhosts/mysite.com/forums.mysite.com/vendor/vanilla/garden-container/src/Container.php(750): Garden\\Container\\Container->createSharedInstance()\n#3 /var/www/vhosts/mysite.com/forums.mysite.com/vendor/vanilla/garden-container/src/Container.php(361): Garden\\Container\\Container->createInstance()\n#4 /var/www/vhosts/mysite.com/forums.mysite.com/vendor/vanilla/garden-container/src/Container.php...'

i thought something got corrupted whle uploading maybe or during downloading the pre-bulit? so i re-downloaded the pre-built and re-uplaoded all the files again and went back to my forums url and again same error and also the same error was there in the logs so i looked around trying to find how to fix this and i came across that if you put $Configuration['Debug'] = TRUE; in config.php then it will show more detailed error so i enabled it and went back to my forums url and this is what was there:

Class 'Vanilla\Dashboard\Models\BannerImageModel' not found

The error occurred on or near: /var/www/vhosts/mysite.com/forums.mysite.com

/library/Vanilla/Site/DefaultSiteSection.php

52:         $this->configLocaleKey = $config->get('Garden.Locale', 'en');
53:         $configDefaultController = $config->get('Routes.DefaultController');
54:         $this->defaultRoute = $router->parseRoute($configDefaultController);
55:         $this->apps = ['forum' => !(bool)$config->get('Vanilla.Forum.Disabled')];
56:         $this->bannerImageLink = $config->get(BannerImageModel::DEFAULT_CONFIG_KEY, '');
57:     }
58: 
59:     /**
60:      * @inheritdoc



here is the Additional information:

• Application: Vanilla
• Application Version: 2021.012
• PHP Version: 7.4.27
• Operating System: Linux
• Server Software: Apache
• User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/REDACTED Safari/537.36
• Request Uri: /dashboard/setup
• Controller: Vanilla\Site\DefaultSiteSection
• Method: __construct