I upgraded my EC2 instance to a larger instance type (with 2 gigs of RAM) and installed again and everything works fine.
The minimum required RAM is 2GB for ERPNext.
Thanks Lawes. Its worked me
It’s Work for me.
it Means User not right’s to access some file…like css
Finally i fix the display problem after run production site.
So it just need to change the permission for the installation directory. On my case, I run this command in :~/frappe-bench$ directory. So go to cd ~/home/[youraccount]/frappe-bench then run:
sudo chmod o+x /home/[your-account-profile]/
eg: sudo chmod o+x /home/admin
The problem is, some answer on the other thread did not explain this properly, so newcomer like me can’t understand 
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