working with csvimport

I am using csvimport for moving files from my old site to a new one based on omeka.

Some of my items are with 1 file and some with more then 1, the problem I have is that the csvimport hangs on the first row (which have only one file and the other columns are empty and represented in the csv file with "").

What is the reason for this and how can I import the files I need to my site?