[Discuss-gnuradio] Frequency Hopping Transmission with USRP N210 : Query

Hi All, 

I have a USRP N210 with RFX2400 2.3-2.9 Ghz RX/TX. I have recorded a trace at 2.41 GHz and stored it to a file filename.dat. I want to transmit the same trace at 2.415, 2.420, 2.425 so on till 2.440. 

So, I used the freq_hopping.py python utility under the python examples folder in gnuradio. 

I give the command python freq_hopping  -i my file.dat & its path -f 2410000000 -t 10 --antenna TX/RX -B 2 -v -c 5 -d 5000000 

However when I run it I get 'Namespace' object has no attribute 'filename' Error. I am running python version 2.7.6 , I also checked the python file and verified whether I am giving all the attributes correctly. 

What may be the problem here ? any help is appreciated.

-Vaibhav