Sign Up error after installation.. cannot login

Traceback (most recent call last):
File “/home/parth/frappe-bench/apps/frappe/frappe/app.py”, line 57, in application
response = frappe.handler.handle()
File “/home/parth/frappe-bench/apps/frappe/frappe/handler.py”, line 22, in handle
data = execute_cmd(cmd)
File “/home/parth/frappe-bench/apps/frappe/frappe/handler.py”, line 61, in execute_cmd
return frappe.call(method, **frappe.form_dict)
File “/home/parth/frappe-bench/apps/frappe/frappe/init.py”, line 1042, in call
return fn(*args, **newargs)
File “/home/parth/frappe-bench/apps/frappe/frappe/core/doctype/user/user.py”, line 773, in sign_up
user.insert()
File “/home/parth/frappe-bench/apps/frappe/frappe/model/document.py”, line 259, in insert
self.run_post_save_methods()
File “/home/parth/frappe-bench/apps/frappe/frappe/model/document.py”, line 919, in run_post_save_methods
self.run_method(“on_update”)
File “/home/parth/frappe-bench/apps/frappe/frappe/model/document.py”, line 787, in run_method
out = Document.hook(fn)(self, *args, **kwargs)
File “/home/parth/frappe-bench/apps/frappe/frappe/model/document.py”, line 1058, in composer
return composed(self, method, *args, **kwargs)
File “/home/parth/frappe-bench/apps/frappe/frappe/model/document.py”, line 1041, in runner
add_to_return_value(self, fn(self, *args, **kwargs))
File “/home/parth/frappe-bench/apps/frappe/frappe/model/document.py”, line 781, in
fn = lambda self, *args, **kwargs: getattr(self, method)(*args, **kwargs)
File “/home/parth/frappe-bench/apps/frappe/frappe/core/doctype/user/user.py”, line 100, in on_update
self.send_password_notification(self.__new_password)
File “/home/parth/frappe-bench/apps/frappe/frappe/core/doctype/user/user.py”, line 204, in send_password_notification
self.send_welcome_mail_to_user()
File “/home/parth/frappe-bench/apps/frappe/frappe/core/doctype/user/user.py”, line 270, in send_welcome_mail_to_user
site_url=get_url(),
File “/home/parth/frappe-bench/apps/frappe/frappe/core/doctype/user/user.py”, line 296, in send_login_mail
delayed=(not now) if now!=None else self.flags.delay_emails, retry=3)
File “/home/parth/frappe-bench/apps/frappe/frappe/init.py”, line 476, in sendmail
inline_images=inline_images, header=header, print_letterhead=print_letterhead)
File “/home/parth/frappe-bench/apps/frappe/frappe/email/queue.py”, line 70, in send
sender = email_account.default_sender
AttributeError: ‘NoneType’ object has no attribute ‘default_sender’
website.js:161:28

Unable to Signup in frappe… it just showing verifying… onlocalhhost:8000

Run another setup on localhost:8000 then try to run your setup on
bench serve --port 8888