Upgrading Drupal

Hi All,

From time to time I get the error on the subject in the PHP log:
"PHP Fatal error: Unsupported operand types in [..]drupal/modules/user/user.module on line 2549"

The error started recently after having upgraded Drupal to 7.16 (from 7.8) and all other modules to up to date versions...

The code in that file looks like this:

hi im complete beginner and basiclaly designing my website through support, youtube videos, google and learning and playing around with drupal myself but have no idea how i can create a cool design for the front page and whole website.

basically we want either a simple website like http://www.a-england.co.uk/ or www.essie.com as we are opening a nail polish line.

I installed Drupal to a host server setting up PHP and My SQL. Found a distribution I would like to try out. Went to install the distribution to a different directory but could not point to same SQL server. What's the best way of moving from basic Drupal to a custom distribution?

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I've followed the upgrade instructions to the letter, with the added luxury of being able to copy the D6 site to a new server first, so the old production site is still running.

I have just upgraded a 7.15 installation to 7.16. Everything seemed to complete fine but when I attempted to take the site out of maintenance mode I received an error saying The Requested URL ..... was not found on this server. I can browse to the home page of the site ok but any other valid path fails.