Comment 4 for bug 1349774

I'm also seeing this problem in my openstack distro build. I could be wrong but it seems to be this import statement from openstack_dashboard/static/dashboard/scss/horizon.scss:

@import "/bootstrap/scss/bootstrap";

I think the intent is to import the bootstrap.scss file but since there is also a folder called bootstrap in the same location it fails with the "IOError: [Errno 21] Is a directory" error. Maybe if the folder or file were just renamed?