Error loading libraries Python

Hello Andrewssobral, i don't understand your step to install python API "/simple_vehicle_counting/build/cp -r ../python/* python/" . But i installed the program normally.
When i run the "demo.py" i have always import errors. The script is on the same root paste of the packet analysis.

Do you have any idea to solve my problem, or what i am doing wrong?

ERROR:

Traceback (most recent call last):
File "demo.py", line 4, in
import analysis
File "/home/miguel/simple_vehicle_counting/python/analysis/__init__.py", line 1, in
from _analysis import *
ImportError: No module named _analysis