Upgrading Drupal

Hi guys, I was recently tasked with performing some upkeep and getting some new functionality on a site that was written in Drupal 4.

As I am looking around around, support for Drupal 4 seems to have dwindled down to almost nothing. And googling about upgrading from drupal 4x to 5x gave me little to nothing. Is there a generally accepted way to upgrade between the two? A guide?

Thanks in advance

My status page tells me:

Charts Charts module not yet configured
Charts core module needs to get some default options in order to operate. You must go to settings page and configure it.

But when I go to the settings page, it tells me:

Access denied
You are not authorized to access this page.

* warning: unlink(sites/default/files/js/gmap_markers.js) [function.unlink]: Permission denied in /var/www/html/ucore/includes/file.inc on line 435.
* The selected file /var/www/html/tmp/fileDiIrlL could not be uploaded, because the destination sites/default/files/js/gmap_markers.js is not properly configured.

/var/www/html/tmp/fileDiIrlL does exist. I'm guessing that the term "uploaded" is used because that file should be added to the database, but it can't for some reason.

Hi,

I recently upgraded to Drupal 6.13 from earlier version and it was kind of a pain. There is no easy way to upgrade.
I had to back everything up, back up database, delete files. Upload files, Reconnect to database.
Reinstall all the modules some of which didn't work properly with newer version, etc.
Basically it' instead of upgrade it was more like clean reinstall.

I'm debating if I should upgrade to 6.14 and go through the same long process or just wait for Drupal 7, which should
Be coming out soon hopefully.

I have a site running on Drupal 6.14 successfully. I tried moving it to a CVS checkout of 6.14, and I get the following error when I run update.php:

An error occurred. http:///update.php?id=25&op=do
Fatal error: Call to undefined function content_field_tablename() in /home/.kicked/jeliasen/drupal-6.14/sites/all/modules/cck/modules/userreference/userreference.install on line 127

On the next page, I get this: The update process was aborted prematurely while running update #6002 in userreference.module. All errors have been logged.

When I go to the administration pages, I see this:
* warning: array_map() [function.array-map]: Argument #2 should be an array in /home/.kicked/jeliasen/drupal-6.14/modules/system/system.module on line 1015.
* warning: array_keys() [function.array-keys]: The first argument should be an array in /home/.kicked/jeliasen/drupal-6.14/includes/theme.inc on line 1771.
* warning: Invalid argument supplied for foreach() in /home/.kicked/jeliasen/drupal-6.14/includes/theme.inc on line 1771.

Here's the status report:
Drupal 6.14
Access to update.php Protected
Configuration file Protected
Cron maintenance tasks Last run 33 min 15 sec ago
You can run cron manually.
Database updates Up to date
Drupal core update status No update data available

I just did my first upgrade in Drupal to 6.1.4 from 6.1.3. Followed the instructions, ran the upgrade.php file and it went fine. Then I went to the Administer menu and when I clicked on Themes or Modules I got a 404 Not Found page. My settings.php file is OK and it's not the .htaccess file. Is it permissions or something else?