You need to make a couple of changes in the user-data script (fullstack_user_data.sh).
fullstack_user_data.sh
Change yum install -y git curl to yum install -y git
yum install -y git curl
yum install -y git
Change yum install -y nginx to amazon-linux-extras install nginx1
yum install -y nginx
amazon-linux-extras install nginx1
Et voilĂ :