Error on completing setup wizard

I got the following error on local installation of Erpnext 7 in Ubuntu 16.04

Traceback (most recent call last):
File “/home/savad/frappe-bench/apps/frappe/frappe/app.py”, line 56, in application
response = frappe.handler.handle()
File “/home/savad/frappe-bench/apps/frappe/frappe/handler.py”, line 19, in handle
execute_cmd(cmd)
File “/home/savad/frappe-bench/apps/frappe/frappe/handler.py”, line 42, in execute_cmd
ret = frappe.call(method, **frappe.form_dict)
File “/home/savad/frappe-bench/apps/frappe/frappe/init.py”, line 907, in call
return fn(*args, **newargs)
File “/home/savad/frappe-bench/apps/frappe/frappe/desk/page/setup_wizard/setup_wizard.py”, line 35, in setup_complete
update_user_name(args)
File “/home/savad/frappe-bench/apps/frappe/frappe/desk/page/setup_wizard/setup_wizard.py”, line 107, in update_user_name
last_name=%(last_name)s WHERE name=%(name)s"“”, args)
File “/home/savad/frappe-bench/apps/frappe/frappe/database.py”, line 138, in sql
self._cursor.execute(query, values)
File “/home/savad/frappe-bench/env/local/lib/python2.7/site-packages/MySQLdb/cursors.py”, line 185, in execute
for key, item in args.iteritems())
KeyError: ‘first_name’

I cannot move forward due to this error . Anyone got idea?

When do you get this error?
Can you please explain the steps you took?
Add screenshots?

Sorry for late reply. I got this error on clicking Complete Setup after entering the Name,Users,Customers ,Suppliers,Item etc after deloying the instance on my server

I only gave details which are required and nothing else in every screen on setup.

I tried again but with same result

I have the same error on my dev site.

I have the same error on my local site.
Someone who has gone through the same and has the solution?

@Fernando_Sanchez1,

Seems like you site is not installed properly, Please reinstall the site using bench --site your_sitename reinstall

Gracias, lo hice y resolvi el problema.