Topic: Permission denied with attachment_fu

Hello, everyone.
I currently work on a site project and after I deployed the project from my computer to the server in my company, something went wrong with uploading images, videos and pdfs.
I use attachment_fu to handle files upload and it give me error like this

"Errno::EACCES in JobAppDocumentsController#create
Permission denied - /var/www/html/virtual/com.luxlucet/LL/LuxLucet/public/job_app_documents/0000/0003/i-9.pdf"
Could someone help me?
Thank you very much!