Failed to generate qrcode - zxing library missing

Hi Team, appreciate for your all contribution on the jasperstarter. It's really a great open source program to allow other environment (php, python) to generate the jasper report without using jasper studio. Recently i am face one of the issues, my current program are required to use jasper starter and python to generate out the reports with qr code. However i hit an error that i can't find any solution from the web. The error messages is describe about the zxing classes are missing (attach with the screen shot ), and i already put those jar file in my library folder. But it doesn't solve my problem. I wonder is this a bug or some setup i missed out? Thank for help and sorry to my broken English.

PS : Those report are work as normal in the jasper studio or Ireport