Module Not Found Error

[EduardoLousinha]

File "detector.py", line 8, in
from mrcnn.model import MaskRCNN
ModuleNotFoundError: No module named 'mrcnn'

Same error occurs when trying to run code of notebook. How do I fix it?

PS: set_regions.py also seems to freeze when the "n" key is pressed and/or crash when the "q" key is pressed.