Preblema registrazioni nuovi utenti

Salve, ho un problema sulle nuove registrazioni, porta un errore

ho lanciato la query ma il problema persiste. Cosa posso fare per risolvere?

Grazie.

query

Citazione:

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ALTER TABLE `phpbb_confirm` ADD `davec_result` CHAR( 6 ) NOT NULL;

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errore

Codice:

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Could not insert data into users table

DEBUG MODE

INSERT INTO phpbb_users (user_registered_ip, user_registered_hostname, user_id, username, user_regdate, user_password, user_email, user_icq, user_website, user_occ, user_from, user_from_flag, user_interests, user_phone, user_selfdes, user_profile_view_popup, user_sig, user_avatar, user_avatar_type, user_viewemail, user_upi2db_which_system, user_upi2db_new_word, user_upi2db_edit_word, user_upi2db_unread_color, user_aim, user_yim, user_msnm, user_skype, user_attachsig, user_allowsmile, user_showavatars, user_showsignatures, user_allowswearywords, user_allowhtml, user_allowbbcode, user_allow_pm_in, user_allow_mass_email, user_allow_viewonline, user_notify, user_notify_pm, user_popup_pm, user_timezone, user_time_mode, user_dst_time_lag, user_dateformat, user_posts_per_page, user_topics_per_page, user_hot_threshold, user_lang, user_style, user_gender, user_level, user_allow_pm, user_birthday, user_birthday_y, user_birthday_m, user_birthday_d, user_next_birthday_greeting, user_active, user_actkey) VALUES
Line : 1131
File : usercp_register.php

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Grazie lo stesso!