upgrade from 6.4 to 7.02 problem

Hi,

 I have problems with upgrade postgerSQL from 6.4 to 7.02

I have installed RH6.0 with default installation of pg 6.4,
First step - installation of rpm was successfull
 $ rpm -i --force postgrerpm7.02

Than I'm trying to install pg 7.02 and the second step
of it was failed :

 $ initdb -l /libdir - r /datadir
 ....
 ....
 Creating template database ...
 ERROR: pg_atoi: error in "uid": cann't parse "uid"
 initdb: couldn't create template database


 in data dir I found '/base' directory with file 'core'.

 That's all ... I need in suggestions.

Thanks.

Igor.