SQLAlchemy error

Getting:
```ProgrammingError: (ProgrammingError) SQLite objects created in a thread can only be used in that same thread.The object was created in thread id 139626447152896 and this is thread id 139626314942208 None None```

When trying to register. AWS EC2 image of 16.06.1 LTS. Followed steps, ran it with python server.py.