django - Permission denied in uploading photos

When I try to upload an Image, I am getting an error:

OSError at /

[Errno 13] Permission denied: '/home/ubuntu/project/django-user-activities/django_user_activities/static/media/uploaded_files/1422722471_11_Tulips.jpg'

I think its related with user permission. But since I am a windows user, and I am hosting this in a ubuntu 14.04 OS, I have no idea how to solve this. How do I resolve this problem/error? I would be very much grateful if you could help me. Thank you.