AttributeError: module 'smarties' has no attribute 'Engine'

[Singh-T]

I am able to run all other examples in the app/ folder but whenever i try running OpenAI gym or atari examples, i get the following error:

Traceback (most recent call last):
File "/home/Downloads/ETH_smarties/smarties/source/smarties/./exec.py", line 96, in
e = rl.Engine(sys.argv)
AttributeError: module 'smarties' has no attribute 'Engine'