Make sure that "cache/*" is writable and then try again
PDOException Object
(
    [message:protected] => SQLSTATE[HY000]: General error: 1364 Field 'exclude_autoasign' doesn't have a default value
    [string:Exception:private] =>
    [code:protected] => HY000
    [file:protected] => /home/admin/web/conexasys.com/public_html/chat/modules/lhinstall/install.php
    [line:protected] => 1548
    [trace:Exception:private] => Array
        (
            [0] => Array
                (
                    [file] => /home/admin/web/conexasys.com/public_html/chat/modules/lhinstall/install.php
                    [line] => 1548
                    [function] => query
                    [class] => PDO
                    [type] => ->
                    [args] => Array
                        (
                            [0] => INSERT INTO `lh_userdep` (`user_id`,`dep_id`,`last_activity`,`hide_online`,`last_accepted`,`active_chats`,`type`,`dep_group_id`) VALUES (1,0,0,0,0,0,0,0)
                        )

                )

            [1] => Array
                (
                    [file] => /home/admin/web/conexasys.com/public_html/chat/lib/core/lhcore/lhmodule.php
                    [line] => 96
                    [args] => Array
                        (
                            [0] => /home/admin/web/conexasys.com/public_html/chat/modules/lhinstall/install.php
                        )

                    [function] => include
                )

            [2] => Array
                (
                    [file] => /home/admin/web/conexasys.com/public_html/chat/lib/core/lhcore/lhmodule.php
                    [line] => 486
                    [function] => runModule
                    [class] => erLhcoreClassModule
                    [type] => ::
                    [args] => Array
                        (
                        )

                )

            [3] => Array
                (
                    [file] => /home/admin/web/conexasys.com/public_html/chat/index.php
                    [line] => 39
                    [function] => moduleInit
                    [class] => erLhcoreClassModule
                    [type] => ::
                    [args] => Array
                        (
                        )

                )

        )

    [previous:Exception:private] =>
    [errorInfo] => Array
        (
            [0] => HY000
            [1] => 1364
            [2] => Field 'exclude_autoasign' doesn't have a default value
        )

)