Fatal error: Uncaught Illuminate\Encryption\MissingAppKeyException: No application encryption key has been specified. in /var/www/html/lib/pkp/lib/vendor/laravel/framework/src/Illuminate/Encryption/EncryptionServiceProvider.php:83 Stack trace: #0 /var/www/html/lib/pkp/lib/vendor/laravel/framework/src/Illuminate/Support/helpers.php(399): Illuminate\Encryption\EncryptionServiceProvider->Illuminate\Encryption\{closure}(NULL) #1 /var/www/html/lib/pkp/lib/vendor/laravel/framework/src/Illuminate/Encryption/EncryptionServiceProvider.php(81): tap(NULL, Object(Closure)) #2 /var/www/html/lib/pkp/lib/vendor/laravel/framework/src/Illuminate/Encryption/EncryptionServiceProvider.php(64): Illuminate\Encryption\EncryptionServiceProvider->key(Array) #3 /var/www/html/lib/pkp/lib/vendor/laravel/framework/src/Illuminate/Encryption/EncryptionServiceProvider.php(32): Illuminate\Encryption\EncryptionServiceProvider->parseKey(Array) #4 /var/www/html/lib/pkp/lib/vendor/laravel/framework/src/Illuminate/Container/Container.php(952): Illuminate\Encryption\EncryptionServiceProvider->Illuminate\Encryption\{closure}(Object(PKP\core\PKPContainer), Array) #5 /var/www/html/lib/pkp/lib/vendor/laravel/framework/src/Illuminate/Container/Container.php(832): Illuminate\Container\Container->build(Object(Closure)) #6 /var/www/html/lib/pkp/lib/vendor/laravel/framework/src/Illuminate/Container/Container.php(763): Illuminate\Container\Container->resolve('encrypter', Array) #7 /var/www/html/lib/pkp/lib/vendor/laravel/framework/src/Illuminate/Container/Container.php(1133): Illuminate\Container\Container->make('Illuminate\\Cont...') #8 /var/www/html/lib/pkp/lib/vendor/laravel/framework/src/Illuminate/Container/Container.php(1043): Illuminate\Container\Container->resolveClass(Object(ReflectionParameter)) #9 /var/www/html/lib/pkp/lib/vendor/laravel/framework/src/Illuminate/Container/Container.php(994): Illuminate\Container\Container->resolveDependencies(Array) #10 /var/www/html/lib/pkp/lib/vendor/laravel/framework/src/Illuminate/Container/Container.php(832): Illuminate\Container\Container->build('PKP\\middleware\\...') #11 /var/www/html/lib/pkp/lib/vendor/laravel/framework/src/Illuminate/Container/Container.php(763): Illuminate\Container\Container->resolve('PKP\\middleware\\...', Array) #12 /var/www/html/lib/pkp/lib/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(198): Illuminate\Container\Container->make('PKP\\middleware\\...') #13 /var/www/html/lib/pkp/lib/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(127): Illuminate\Pipeline\Pipeline->Illuminate\Pipeline\{closure}(Object(Illuminate\Http\Request)) #14 /var/www/html/lib/pkp/classes/core/Dispatcher.php(179): Illuminate\Pipeline\Pipeline->then(Object(Closure)) #15 /var/www/html/lib/pkp/classes/core/Dispatcher.php(114): PKP\core\Dispatcher->initSession() #16 /var/www/html/lib/pkp/classes/core/PKPApplication.php(429): PKP\core\Dispatcher->dispatch(Object(APP\core\Request)) #17 /var/www/html/index.php(21): PKP\core\PKPApplication->execute() #18 {main} thrown in /var/www/html/lib/pkp/lib/vendor/laravel/framework/src/Illuminate/Encryption/EncryptionServiceProvider.php on line 83