AttributeError: 'NoneType' object has no attribute 'drivername'

class Config:
  SECRET_KEY = 'SECRET_KEY'
  SQLALCHEMY_DATABASE_URI = 'SQLALCHEMY_DATABASE_URI'
  MAIL_SERVER = 'smtp.googlemail.com'
  MAIL_PORT = 587
  MAIL_USE_TLS = True
  MAIL_USERNAME = os.environ.get('EMAIL_USER')
  MAIL_PASSWORD = os.environ.get('EMAIL_PASS')

AttributeError: 'NoneType' object has no attribute 'drivername'

sqlalchemy.exc.OperationalError: (sqlite3.OperationalError) no such
table: post [SQL: 'SELECT post.id AS post_id, post.title AS
post_title, post.date_posted AS post_date_posted, post.content AS
post_content, post.user_id AS post_user_id nFROM post ORDER BY
post.date_posted DESCn LIMIT ? OFFSET ?'] [parameters: (5, 0)]
(Background on this error at: http://sqlalche.me/e/e3q8)