Import Error during Python Test

I am trying to run the python3 test as described in the INSTALL.md file. I correctly installed the RoHC library and the python biding.
When I try to run the python test with the command 'python3 ./contrib/python/example.py 10'
I got the following error:
Traceback (most recent call last):
  File "./contrib/python/example.py", line 39, in <module>
    from rohc import *
  File "~/RoHC_Folder/rohc-2.3.1/contrib/python/rohc.py", line 15, in <module>
    import _rohc
ImportError: librohc.so.3: cannot open shared object file: No such file or directory

I understand that it does not find a library, but I correctly installed all of them.