Solution :
1. Check your disk usage, is it filled completely? Empty some space, restart Apache and check again.
2. If above solution is not applicable,
Remove the file symfony/cache/orangehrm/prod/config/config_autoload.yml.php. Now open the page in browser again. It will create new config_autoload.yml.php. Error should be gone now.
Make sure the directory has write permissions to create the file.
1. Check your disk usage, is it filled completely? Empty some space, restart Apache and check again.
2. If above solution is not applicable,
Remove the file symfony/cache/orangehrm/prod/config/config_autoload.yml.php. Now open the page in browser again. It will create new config_autoload.yml.php. Error should be gone now.
Make sure the directory has write permissions to create the file.