rpy2 works good in PyCharm and doesn't work in

Question

I am making an app using rpy2 library in Python 3.6.1. Everything works great when I am running the script from PyCharm but in .exe file there is a problem. When I click on the button (I am using tkinter for GUI) I don't get any statistics calculated in rpy2 (and again, everything works in PyCharm). I used cx_freeze to convert to .exe file. Does anyone have the idea what is the problem ? Thanks