Error messages when upgrading Drupal 5.2 to Drupal 6.1

Hi,

I am getting below error messages while trying to upgrade from Drupal 5.2 to Drupal 6.1. I am not sure whether I am missing something or this would be something to resolve elsewhere. Thanks.

Warning: Unknown column 'serialized' in 'field list' query: SELECT data, created, headers, expire, serialized FROM cache WHERE cid = 'variables' in C:\xampp\htdocs\example.com\includes\database.mysql.inc on line 128

Warning: Unknown column 'serialized' in 'field list' query: UPDATE cache SET data = 'a:334:{s:13:\"theme_default\";s:7:\"garland\";s:13:\"filter_html_1\";i:1;s:18:\"node_options_forum\";a:1:{i:0;s:6:\"status\";}s:17:\"menu_primary_menu\";s:1:\"2\";s:19:\"menu_secondary_menu\";s:3:\"106\";s:15:\"install_profile\";s:7:\"default\";s:17:\"node_options_page\";a:1:{i:0;s:6:\"status\";}s:14:\"theme_settings\";a:18:{s:11:\"toggle_logo\";i:1;s:11:\"toggle_name\";i:0;s:13:\"toggle_slogan\";i:1;s:14:\"toggle_mission\";i:1;s:24:\"toggle_node_user_picture\";i:0;s:27:\"toggle_comment_user_picture\";i:0;s:13:\"toggle_search\";i:0;s:14:\"toggle_favicon\";i:1;s:21:\"toggle_node_info_page\";i:0;s:22:\"toggle_node_info_story\";i:1;s:12:\"default_logo\";i:1;s:9:\" in C:\xampp\htdocs\example.com\includes\database.mysql.inc on line 128

Warning: Cannot modify header information - headers already sent by (output started at C:\xampp\htdocs\example.com\includes\database.mysql.inc:128) in C:\xampp\htdocs\example.com\includes\bootstrap.inc on line 577

Warning: Cannot modify header information - headers already sent by (output started at C:\xampp\htdocs\example.com\includes\database.mysql.inc:128) in C:\xampp\htdocs\example.com\includes\bootstrap.inc on line 578

Warning: Cannot modify header information - headers already sent by (output started at C:\xampp\htdocs\example.com\includes\database.mysql.inc:128) in C:\xampp\htdocs\example.com\includes\bootstrap.inc on line 579

Warning: Cannot modify header information - headers already sent by (output started at C:\xampp\htdocs\example.com\includes\database.mysql.inc:128) in C:\xampp\htdocs\example.com\includes\bootstrap.inc on line 580

Warning: Unknown column 'language' in 'where clause' query: SELECT src FROM url_alias WHERE dst = 'node' AND language IN('en', '') ORDER BY language DESC in C:\xampp\htdocs\example.com\includes\database.mysql.inc on line 128

Fatal error: Only variables can be passed by reference in C:\xampp\htdocs\example.com\sites\all\modules\cck\content_copy.module on line 175