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Error in reading and writing CSV format file in python

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In the programme below I am trying to read two csv format files and process
them and write a new file with some of theirs data.

import csv
f1_reader = csv.reader(open(r"Z:\Weka
work\Feature_Vectors_Fullset_00.arff"))
f2_reader = csv.reader(open(r"Z:\Weka
work\Feature_Vectors_Fullset_00_noxy+class.arff"))
nf = open(r"Z:\Weka work\classified_image00_withoutxy.arff", "w")

while True:
    l1 = f1_reader.next()
    while len(l1) != 12:
        l1 = f1_reader.next()
    l2 = f2_reader.next()
    while len(l2) != 11:
        l2 = f2_reader.next()

    ix = l1[0].strip()
    iy = l1[1].strip()
    classification = l2[8].strip()

    print >> nf, ix, iy, classification

nf.close()

This programme is giving me this error now :

Traceback (most recent call last):
  File "Z:\Weka work\final_image_classificationwithoutxy.py", line 16, in
<module>
    l2 = f2_reader.next()
StopIteration


what could be a possible reason to StopIteration ???


I checked the syntax and usage of this module looks alright to me , but
then why this error ?


Thankyou in Advance

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Thread

Error in reading and writing CSV format file in python inshu chauhan <insideshoes@gmail.com> - 2013-02-11 12:00 +0100
  Re: Error in reading and writing CSV format file in python Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-02-11 23:26 +1100
    Re: Error in reading and writing CSV format file in python inshu chauhan <insideshoes@gmail.com> - 2013-02-11 13:44 +0100
    Re: Error in reading and writing CSV format file in python MRAB <python@mrabarnett.plus.com> - 2013-02-11 13:02 +0000
    Re: Error in reading and writing CSV format file in python inshu chauhan <insideshoes@gmail.com> - 2013-02-11 14:09 +0100

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