error in handler

Servers: Apache 2.0.x, PHP 5.1.x, MySQL 5.0.x, DRUPAL 4.7.5
USER AGENTS: IE7, IE6, FF 1.5

I got: ERROR: The XML response that was returnes from the server is invalid.

Also: Is a must to have allow_call_time_pass_reference to TRUE?

Thanks in advance

Parameters: Array
(
[data_private_path] => C:\Archivos de programa\EasyPHP 2.0b1\www\files\phpfreechat
[data_public_path] => C:\Archivos de programa\EasyPHP 2.0b1\www\modules\phpfreechat\phpfreechat\data\public
[data_public_url] => /modules/phpfreechat/phpfreechat/data/public
[themepath] => C:\Archivos de programa\EasyPHP 2.0b1\www\modules\phpfreechat\phpfreechat\themes
[theme_url] => /modules/phpfreechat/phpfreechat/themes
[serverid] => 18a8d1f99703ca7f085b4951915c23fa
[server_script_path] => C:\Archivos de programa\EasyPHP 2.0b1\www\modules\phpfreechat\handler.php
[server_script_url] => /modules/phpfreechat/handler.php
[title] => Noticia de prueba
[channels] => Array
(
[0] => Noticia de prueba
)

[max_nick_len] => 14
[max_text_len] => 250
[max_msg] => message history length
[connect_at_startup] => 1
[language] => i18n/es_ES
[container_type] => File
[debug] => 1
[debugxajax] => 1
[nick] => pablo
[isadmin] => 1
)
Session: Array
(
[CiviCRM] => Array
(
[domainID] => 1
[ufID] => 1
[userID] => 104
[ufEmail] => pablo@localhost
)

[watchdog_overview_filter] => all
[pfcuserconfig_18a8d1f99703ca7f085b4951915c23fa_nick] =>
[pfcuserconfig_18a8d1f99703ca7f085b4951915c23fa_active] =>
[pfcuserconfig_18a8d1f99703ca7f085b4951915c23fa_channels] => Array
(
)

[pfcuserconfig_18a8d1f99703ca7f085b4951915c23fa_privmsg] => Array
(
)

)
Cookies: Array
(
[PHPSESSID] => d3knn9i47gi64u97off02pdcv7
)