[Click] empty file

[Enrico]

Hi, i have a problem:

my configuration:

require(models);
d::FromDevice(eth0)-> Strip(14)-> CheckIPHeader(BADSRC 18.26.4.255
2.255.255.255 1.255.255.255)
-> IPClassifier(tcp)-> a :: AggregateIPFlows ->
TCPCollector(tcpinfo.xml, SOURCE d, NOTIFIER a)
-> Discard;

This code generates a xml file but it is locked, I don't succeed to open
it! 
Same problem when I use element as ToIPSummaryDump...my code generates a
file but
is empty and I don't succeed to open it..