Upgrading Drupal

I have 3 drupal websites. They were created with different version of drupal months ago (one website owns one drupal installation). Now I want to upgrade to drupal 6.15 and integrate these 3 websites into one drupal installation (/drupal/sites/site1,/drupal/sites/site2,/drupal/sites/site3).

Can I just modify settings.php in each slave site folder to point to corresponding database and move themes/modules into new drupal then enable later?

Or anything missing?

Many thanks.

After upgrading to 6.15, I can no longer access mysite.com/admin. It shows a blank screen. Once I am logged in I can access all of the pages by using the navigation, however the /admin just shows a blank white screen. How can I fix this?

Hi, I performed the upgrade then added few pages to my site.

Afterwards, I wanted to generate and submit a new sitemap.xml but the free generator I usually use always says "An error occurred while generating sitemap".

All the other sites I run with Drupal work, except this one that I recently upgraded.

Has anybody else experienced the same?

Thank you.

Ever since I have upgraded drupal my tabs above my main content (var $tabs) all link to my home page. I cannot figure out why this is. I have installed the devel module and it looks as if the queries are being built correctly. I believe it to be a particular module. Though I am unsure which module it might be. It is a production site, so I don't have a whole lot of leway. I was hoping someone has experienced this before and knows the exact solution. Thanks.

Hi guys,
I know Drupal for some months now and only dealt with Drupal 6 so far.
I was asked to upgrade an old Drupal site which is still in version 4.7.11

It seems that upgrading from 4 to 6 is already a nice exercise for a Drupal beginner. But it's even getting better :
the server where the site was hosted was closing down. I just had the time to copy the files and the database.
And I don't have the admin password, (but I guess that's the smallest problem..)
The site was installed together with other sites in a multi-site installation. I only had access to the folders that concerned the site itself. I don't know if I miss some parts of the site because of that (modules that were in a folder I could not acces..)
And of course the old hoster, who was also the person that set up the drupal site some years ago, is unreachable !
A dream situation :-\

I tried to reinstall the site with Drupal 4.7.11 on my local host. But I only get the homepage all right. The links to all the other pages don't work.
I have met that problem with a Drupal 6 site, too. There the solution was to disable "Clean URLs" before exporting the database. Could that be the solution for a 4.7.11 site, too?
If yes : in my case I can't login as admin and disable the clean URL option. Is there a way to do that in phpMyAdmin directly?

I upgraded to 6.15 from 6.14 and I get this error when I try update.php:

Fatal error: Call to undefined function user_access() in /home/user1/public_html/includes/theme.inc on line 934

When I try to access the site (I'm logged in as admin) the error is:

Fatal error: Call to undefined function user_access() in /home/user1/public_html/includes/menu.inc on line 2476

I have removed and replaced the 6.15 files at least a dozen times today. I have all the folders in place and everything has the right permissions. I've cleared caches. Yet the errors continue.

Any ideas? I looked at other people's problems, but I don't have another installation of Drupal in my sites/all/modules folder, so that didn't help.