line 7 import bitstring!!!!!

[peseta3]

Hallo,
I get this if I Type the follow line:

root@kali:~/rfcat_150225/rfpwnon# python rfpwnon.py -v

Traceback (most recent call last):
  File "rfpwnon.py", line 7, in <module>
    import bitstring
ImportError: No module named bitstring

root@kali:~/rfcat_150225/rfpwnon# python rfpwnon.py -f 433883200
Traceback (most recent call last):
  File "rfpwnon.py", line 7, in <module>
    import bitstring
ImportError: No module named bitstring
root@kali:~/rfcat_150225/rfpwnon# 

which can it be?

[peseta3]

ok I forgot to install bitstring