Domain is currently unable to handle this request on a Laravel project

so I've been facing this problem all week and can't seem to figure out what the problem is.

Whenever I try to access my app online I get the following error.

[the-domain] is currently unable to handle this request.

I'm currently lost and don't even know what the problem is I've replicated my local environment on my server and the problem still persists, probably something I'm missing.

Here is my current config.

Laravel version: 5.7 PHP version: 7.2.9

Heres the stack trace form laravel.log:

[2018-09-30 12:18:28] staging.ERROR: syntax error, unexpected '|', expecting variable (T_VARIABLE) {"exception":"[object] (Symfony\\Component\\Debug\\Exception\\F$
[stacktrace]
#0 /var/www/avanzi/vendor/composer/ClassLoader.php(322): Composer\\Autoload\\includeFile('/var/www/invite...')
#1 [internal function]: Composer\\Autoload\\ClassLoader->loadClass('Illuminate\\\\Supp...')
#2 /var/www/avanzi/vendor/laravel/framework/src/Illuminate/Database/Eloquent/Model.php(22): spl_autoload_call('Illuminate\\\\Supp...')
#3 /var/www/avanzi/vendor/composer/ClassLoader.php(444): include('/var/www/invite...')
#4 /var/www/avanzi/vendor/composer/ClassLoader.php(322): Composer\\Autoload\\includeFile('/var/www/invite...')
#5 [internal function]: Composer\\Autoload\\ClassLoader->loadClass('Illuminate\\\\Data...')
#6 /var/www/avanzi/vendor/laravel/framework/src/Illuminate/Database/DatabaseServiceProvider.php(35): spl_autoload_call('Illuminate\\\\Data...')
#7 /var/www/avanzi/vendor/laravel/framework/src/Illuminate/Foundation/Application.php(572): Illuminate\\Database\\DatabaseServiceProvider->register()
#8 /var/www/avanzi/vendor/laravel/framework/src/Illuminate/Foundation/ProviderRepository.php(75): Illuminate\\Foundation\\Application->register(Object(Illumin$
#9 /var/www/avanzi/vendor/laravel/framework/src/Illuminate/Foundation/Application.php(548): Illuminate\\Foundation\\ProviderRepository->load(Array)
#10 /var/www/avanzi/vendor/laravel/framework/src/Illuminate/Foundation/Bootstrap/RegisterProviders.php(17): Illuminate\\Foundation\\Application->registerConfi$
#11 /var/www/avanzi/vendor/laravel/framework/src/Illuminate/Foundation/Application.php(206): Illuminate\\Foundation\\Bootstrap\\RegisterProviders->bootstrap(O$
#12 /var/www/avanzi/vendor/laravel/framework/src/Illuminate/Foundation/Http/Kernel.php(162): Illuminate\\Foundation\\Application->bootstrapWith(Array)
#13 /var/www/avanzi/vendor/laravel/framework/src/Illuminate/Foundation/Http/Kernel.php(146): Illuminate\\Foundation\\Http\\Kernel->bootstrap()
#14 /var/www/avanzi/vendor/laravel/framework/src/Illuminate/Foundation/Http/Kernel.php(116): Illuminate\\Foundation\\Http\\Kernel->sendRequestThroughRouter(Ob$
#15 /var/www/avanzi/public/index.php(58): Illuminate\\Foundation\\Http\\Kernel->handle(Object(Illuminate\\Http\\Request))
#16 {main}
"}

Hope someone can help? Thanks in advance.

via Chebli Mohamed