In my case i tried each and every solution available. But when I checked the log I found one error:
production.ERROR: No application encryption key has been specified. {"exception":"[object] (RuntimeException(code: 0): No application encryption key has been specified. at /home/******/public_html/**subdomain name*/vendor/laravel/framework/src/Illuminate/Encryption/EncryptionServiceProvider.php:44)
[stacktrace]
Then I searched for .env file in my project structure.(Check the hidden files list). In my project .env was not there by default only .env.example file was there.
so i created one .env and added
APP_NAME=Laravel
APP_ENV=local
APP_KEY=xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
APP_DEBUG=true
APP_URL=http://localhost
LOG_CHANNEL=stack
DB_CONNECTION=mysql
DB_HOST=127.0.0.1
DB_PORT=3306
DB_DATABASE=xxxxxxxxxxxxxxxxxxx
DB_USERNAME=xxxxxxxxxxxxxxxxxxx
DB_PASSWORD=xxxxxxxxxxxxxxxxxxx
BROADCAST_DRIVER=log
CACHE_DRIVER=file
QUEUE_CONNECTION=sync
SESSION_DRIVER=file
SESSION_LIFETIME=120
REDIS_HOST=127.0.0.1
REDIS_PASSWORD=null
REDIS_PORT=6379
MAIL_DRIVER=smtp
MAIL_HOST=smtp.mailtrap.io
MAIL_PORT=2525
MAIL_USERNAME=null
MAIL_PASSWORD=null
MAIL_ENCRYPTION=null
AWS_ACCESS_KEY_ID=
AWS_SECRET_ACCESS_KEY=
AWS_DEFAULT_REGION=us-east-1
AWS_BUCKET=
PUSHER_APP_ID=
PUSHER_APP_KEY=
PUSHER_APP_SECRET=
PUSHER_APP_CLUSTER=mt1
MIX_PUSHER_APP_KEY="${PUSHER_APP_KEY}"
MIX_PUSHER_APP_CLUSTER="${PUSHER_APP_CLUSTER}"
I have generated one APP_KEY. For this I used
php artisan key:generate --show
Then I kept the key in the .env. Then Its done. Hope it may help someone