Upgrading Drupal

Sub:The site is currently not available due to technical problems

How can i overcome this problem ?

What are the changes in the settings.php file?

Please give the suggestions

* warning: mail() [function.mail]: Failed to connect to mailserver at "localhost" port 25, verify your "SMTP" and "smtp_port" setting in php.ini or use ini_set() in C:\xampp\htdocs\drupal-6.19\includes\mail.inc on line 193.
* Unable to send e-mail. Please contact the site administrator if the problem persists.

Hi Guys/Gals,

I went through the tutorial in ugrading a site. I disabled the modules, put the theme back to garland, backed up the databases. I upgraded via the cpanel in my hosting providers site. Then I went to the update.php and I got these errors...

user warning: Table 'semaphore' already exists query: CREATE TABLE semaphore ( `name` VARCHAR(255) NOT NULL DEFAULT '', `value` VARCHAR(255) NOT NULL DEFAULT '', `expire` DOUBLE NOT NULL, PRIMARY KEY (name), INDEX expire (expire) ) /*!40100 DEFAULT CHARACTER SET UTF8 */ in /home/apexpape/public_html/includes/database.inc on line 555.
user warning: Can't DROP 'src_language'; check that column/key exists query: ALTER TABLE url_alias DROP INDEX src_language in /home/apexpape/public_html/includes/database.mysql-common.inc on line 448.
user warning: Can't DROP 'dst_language'; check that column/key exists query: ALTER TABLE url_alias DROP KEY dst_language in /home/apexpape/public_html/includes/database.mysql-common.inc on line 417.
user warning: Duplicate key name 'src_language_pid' query: ALTER TABLE url_alias ADD INDEX src_language_pid (src, language, pid) in /home/apexpape/public_html/includes/database.mysql-common.inc on line 434.

I am working on upgrading from 5.x to 6.x. Really it is 5.23 to 6.19, but am running into issues. I have upgraded all modules in 5.x to the most updated versions and everything is running fine. I have updated all files to 6.19 and have ran the update.php script. During the upgrade process, I receive several errors, such as:

user warning: Table 'drupal.semaphore' doesn't exist query: SELECT expire, value FROM semaphore WHERE name = 'menu_rebuild' in /var/www/html2/includes/lock.inc on line 149.

user warning: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ') ORDER BY fit DESC LIMIT 0, 1' at line 1 query: SELECT path FROM menu_router WHERE path IN () ORDER BY fit DESC LIMIT 0, 1 in /var/www/html2/includes/menu.inc on line 2099.

Everything looks to be running fine on the system, except for menus. It appears as though only about 10 menus have imported into the new menu tables. However, all of the menus are showing in the blocks tables.

Hi all,

After upgrading Drupal to the 6.19 release, all overriding functions I had in a custom module (mainly for the apachesolr module) stopped working. Has anyone experienced anything like that?

Thanks for any help,

Notice: Undefined index: und in comment_admin_overview() (line 107 of /home/u112612/modules/comment/comment.admin.inc).

How to fix that.

Thanks.