HELP needed : COPY datas from file

Hi

I have a problem to copy datas from unix file, I get the following message
when I try to import
a file with more 200000 lines :

pgReadData() -- backend closed the channel unexpectedly
This probably means the backend terminated abnormally before or while
processing the request.
We have lost the connection to the backend, so further processing is
impossible. Terminating.

I use postgres 6.4.2 on solaris.

Thanks for your help!

--
ENG Ming Hung
mheng(at)hachette-multimedia(dot)fr