Fatal Erros in some places

Hi

I'm using drupal 6.9 with mysql, and, after install ejournal and crate a journal, everytime I try to login with admin account, it gives me a blank page with this:

"Fatal error: Unsupported operand types in /var/www/melro.ginux.ufla.br/htdocs/bazar-teste2/includes/common.inc on line 1376"

And when I try to acess a node that is an article approved or either waiting for aproval, I get this error too.