database_setup.py unable to open database file

[anushalihala]

Traceback (most recent call last):
File "database_setup.py", line 44, in
Base.metadata.create_all(engine)
File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/sql/schema.py", line 4321, in create_all
ddl.SchemaGenerator, self, checkfirst=checkfirst, tables=tables
File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/engine/base.py", line 2057, in _run_visitor
with self._optional_conn_ctx_manager(connection) as conn:
File "/usr/lib/python2.7/contextlib.py", line 17, in enter
return self.gen.next()
File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/engine/base.py", line 2049, in _optional_conn_ctx_manager
with self._contextual_connect() as conn:
File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/engine/base.py", line 2251, in _contextual_connect
self._wrap_pool_connect(self.pool.connect, None),
File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/engine/base.py", line 2289, in _wrap_pool_connect
e, dialect, self
File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/engine/base.py", line 1555, in handle_dbapi_exception_noconnection
sqlalchemy_exception, with_traceback=exc_info[2], from=e
File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/engine/base.py", line 2285, in _wrap_pool_connect
return fn()
File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/pool/base.py", line 363, in connect
return _ConnectionFairy._checkout(self)
File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/pool/base.py", line 773, in _checkout
fairy = _ConnectionRecord.checkout(pool)
File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/pool/base.py", line 492, in checkout
rec = pool._do_get()
File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/pool/impl.py", line 238, in _do_get
return self._create_connection()
File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/pool/base.py", line 308, in _create_connection
return _ConnectionRecord(self)
File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/pool/base.py", line 437, in init
self.__connect(first_connect_check=True)
File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/pool/base.py", line 657, in __connect
pool.logger.debug("Error on connect(): %s", e)
File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/util/langhelpers.py", line 69, in exit
exc_value, with_traceback=exc_tb,
File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/pool/base.py", line 652, in __connect
connection = pool._invoke_creator(self)
File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/engine/strategies.py", line 114, in connect
return dialect.connect(*cargs, **cparams)
File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/engine/default.py", line 490, in connect
return self.dbapi.connect(*cargs, **cparams)
sqlalchemy.exc.OperationalError: (sqlite3.OperationalError) unable to open database file