Unable to Login it Site with the following error

When i was trying to bench start the erpnext ,the site was opening for sometime and i can’t login in to the site ,and after sometime it is showing error like this…
RuntimeError

RuntimeError: no object bound to db
Traceback (most recent call last)

File "/home/ubuntu/frappe-bench/apps/frappe/frappe/middlewares.py", line 15, in __call__

return super(StaticDataMiddleware, self).__call__(environ, start_response)

File "/home/ubuntu/frappe-bench/env/lib/python2.7/site-packages/werkzeug/wsgi.py", line 600, in __call__

return self.app(environ, start_response)

File "/home/ubuntu/frappe-bench/env/lib/python2.7/site-packages/werkzeug/wsgi.py", line 600, in __call__

return self.app(environ, start_response)

File "/home/ubuntu/frappe-bench/env/lib/python2.7/site-packages/werkzeug/local.py", line 228, in application

return ClosingIterator(app(environ, start_response), self.cleanup)

File "/home/ubuntu/frappe-bench/env/lib/python2.7/site-packages/werkzeug/wrappers.py", line 301, in application

return f(*args[:-2] + (request,))(*args[-2:])

File "/home/ubuntu/frappe-bench/apps/frappe/frappe/app.py", line 83, in application

response = handle_exception(e)

File "/home/ubuntu/frappe-bench/apps/frappe/frappe/app.py", line 181, in handle_exception

response = frappe.website.render.render("message", http_status_code=http_status_code)

File "/home/ubuntu/frappe-bench/apps/frappe/frappe/website/render.py", line 28, in render

path = resolve_path(path.strip('/ '))

File "/home/ubuntu/frappe-bench/apps/frappe/frappe/website/render.py", line 205, in resolve_path

path = resolve_from_map(path)

File "/home/ubuntu/frappe-bench/apps/frappe/frappe/website/render.py", line 211, in resolve_from_map

for r in get_website_rules()])

File "/home/ubuntu/frappe-bench/apps/frappe/frappe/website/render.py", line 236, in get_website_rules

return frappe.cache().get_value('website_route_rules', _get)

File "/home/ubuntu/frappe-bench/apps/frappe/frappe/utils/redis_wrapper.py", line 72, in get_value

val = generator()

File "/home/ubuntu/frappe-bench/apps/frappe/frappe/website/render.py", line 230, in _get

for d in frappe.get_all('DocType', 'name, route', dict(has_web_view=1)):

File "/home/ubuntu/frappe-bench/apps/frappe/frappe/__init__.py", line 1155, in get_all

return get_list(doctype, *args, **kwargs)

File "/home/ubuntu/frappe-bench/apps/frappe/frappe/__init__.py", line 1128, in get_list

return frappe.model.db_query.DatabaseQuery(doctype).execute(None, *args, **kwargs)

File "/home/ubuntu/frappe-bench/apps/frappe/frappe/model/db_query.py", line 88, in execute

result = self.build_and_run()

File "/home/ubuntu/frappe-bench/apps/frappe/frappe/model/db_query.py", line 100, in build_and_run

args = self.prepare_args()

File "/home/ubuntu/frappe-bench/apps/frappe/frappe/model/db_query.py", line 117, in prepare_args

self.set_optional_columns()

File "/home/ubuntu/frappe-bench/apps/frappe/frappe/model/db_query.py", line 218, in set_optional_columns

columns = frappe.db.get_table_columns(self.doctype)

File "/home/ubuntu/frappe-bench/env/lib/python2.7/site-packages/werkzeug/local.py", line 347, in __getattr__

return getattr(self._get_current_object(), name)

File "/home/ubuntu/frappe-bench/env/lib/python2.7/site-packages/werkzeug/local.py", line 310, in _get_current_object

raise RuntimeError('no object bound to %s' % self.__name__)

RuntimeError: no object bound to db

@rmehta sry to trouble you can you please help me with this

Have you edited with site_config.json?

Does ‘bench mysql’ connect to the db?

A search turns up this old similar case