The stream or file "/home/project/public_html/projectfolder/storage/logs/laravel.log" could not be opened: failed to open stream: Permission denied

guys iam working with a online student exam application.

i have hosted the application in cpanel and everything went fine. suddenly i face an error from today morning

The stream or file "/home/project/public_html/projectfolder/storage/logs/laravel.log" could not be opened: failed to open stream: Permission denied

vendor/monolog/monolog/src/Monolog/Handler/StreamHandler.php

it showing like this. through my cpanel terminal i did all the below

php artisan optimize
php artisan cache:clear
php artisan route:cache
php artisan view:clear
php artisan config:cache

composer dump-autoload

but still the same error. when i referred in google it show to restart the Apache or change the permission

but when i asked my server team they saying the permission is correct. it is a fault in laravel application only.

what i should do now??

this is my cpanel permission : https://imgur.com/DnFekGp

the application went smoothly. but from today morning its saying like this

do i need to check from my cpanel? do i need to check from my WHM? do i need to check in my laravel application?

kindly some one suggest your idea please