ERPNext Setup Wizard error

I installed ERPNext from ERPNext-Dev.ova over Virtual Box. My OS is Ubuntu 16.04 LTS.
In setup wizard, I got this error message.
Screenshot-2018-4-13 Frappe Desk

What shall I do?

hello @catmanti,
I think you have not follow properly installation steps.
Followed below steps and install ERPNext Framework:

Short steps for Build site and apps:

  1. Create a new apps:
    frappe-bench$ bench new-app <>

  2. Create a new site:
    frappe-bench$ bench new-site <>

Optional:
3) Add a frappe apps:
frappe-bench$ bench get-app erpnext https://github.com/frappe/erpnext –branch master
bench get-app erpnext https://github.com/Solufyin/erpnext --branch develop

  1. Install site:
    frappe-bench$ bench --site <> install-app erpnext

  2. Configure developer mode:
    frappe-bench$ bench --site <> set-config developer_mode 1

  3. Configure host name:
    frappe-bench$ sudo gedit /etc/hosts
    Add a line: 127.0.0.1 <

  4. Start bench:
    frappe-bench$ bench start

  5. Access through browser: http://site.dev:8000

Thanks.

Thank You!
Now it is working.

Hello @catmanti,

if your issue is resolved then you can mark it as Solution.

Thanks.