Olá a todos!

Estou começando a usar o Drupal agora :-)

Pesquisando descobri um módulo (webForm) que permite criar formulários elaborados! Fui fazer uns testes e ao enviar o form recebi o erro abaixo. Alguém pode me dar um help de como resolvo este problema, as informações do cadastro estão sendo armazenadas em banco, mais o e-mail não está sendo enviado.

warning: call_user_func_array() [function.call-user-func-array]: First argument is expected to be a valid callback, 'theme_webform_mail_textfield' was given in C:\wamp\www\drupal-6.2\includes\theme.inc on line 591.
warning: call_user_func_array() [function.call-user-func-array]: First argument is expected to be a valid callback, 'theme_webform_mail_textfield' was given in C:\wamp\www\drupal-6.2\includes\theme.inc on line 591.
warning: call_user_func_array() [function.call-user-func-array]: First argument is expected to be a valid callback, 'theme_webform_mail_date' was given in C:\wamp\www\drupal-6.2\includes\theme.inc on line 591.
warning: call_user_func_array() [function.call-user-func-array]: First argument is expected to be a valid callback, 'theme_webform_mail_textfield' was given in C:\wamp\www\drupal-6.2\includes\theme.inc on line 591.
warning: call_user_func_array() [function.call-user-func-array]: First argument is expected to be a valid callback, 'theme_webform_mail_date' was given in C:\wamp\www\drupal-6.2\includes\theme.inc on line 591.
warning: call_user_func_array() [function.call-user-func-array]: First argument is expected to be a valid callback, 'theme_webform_mail_select' was given in C:\wamp\www\drupal-6.2\includes\theme.inc on line 591.
warning: call_user_func_array() [function.call-user-func-array]: First argument is expected to be a valid callback, 'theme_webform_mail_textfield' was given in C:\wamp\www\drupal-6.2\includes\theme.inc on line 591.
warning: call_user_func_array() [function.call-user-func-array]: First argument is expected to be a valid callback, 'theme_webform_mail_select' was given in C:\wamp\www\drupal-6.2\includes\theme.inc on line 591.
warning: call_user_func_array() [function.call-user-func-array]: First argument is expected to be a valid callback, 'theme_webform_mail_textfield' was given in C:\wamp\www\drupal-6.2\includes\theme.inc on line 591.
warning: call_user_func_array() [function.call-user-func-array]: First argument is expected to be a valid callback, 'theme_webform_mail_pagebreak' was given in C:\wamp\www\drupal-6.2\includes\theme.inc on line 591.
warning: call_user_func_array() [function.call-user-func-array]: First argument is expected to be a valid callback, 'theme_webform_mail_textfield' was given in C:\wamp\www\drupal-6.2\includes\theme.inc on line 591.
warning: call_user_func_array() [function.call-user-func-array]: First argument is expected to be a valid callback, 'theme_webform_mail_textfield' was given in C:\wamp\www\drupal-6.2\includes\theme.inc on line 591.
warning: call_user_func_array() [function.call-user-func-array]: First argument is expected to be a valid callback, 'theme_webform_mail_date' was given in C:\wamp\www\drupal-6.2\includes\theme.inc on line 591.
warning: call_user_func_array() [function.call-user-func-array]: First argument is expected to be a valid callback, 'theme_webform_mail_textfield' was given in C:\wamp\www\drupal-6.2\includes\theme.inc on line 591.
warning: call_user_func_array() [function.call-user-func-array]: First argument is expected to be a valid callback, 'theme_webform_mail_date' was given in C:\wamp\www\drupal-6.2\includes\theme.inc on line 591.
warning: call_user_func_array() [function.call-user-func-array]: First argument is expected to be a valid callback, 'theme_webform_mail_select' was given in C:\wamp\www\drupal-6.2\includes\theme.inc on line 591.
warning: call_user_func_array() [function.call-user-func-array]: First argument is expected to be a valid callback, 'theme_webform_mail_textfield' was given in C:\wamp\www\drupal-6.2\includes\theme.inc on line 591.
warning: call_user_func_array() [function.call-user-func-array]: First argument is expected to be a valid callback, 'theme_webform_mail_select' was given in C:\wamp\www\drupal-6.2\includes\theme.inc on line 591.
warning: call_user_func_array() [function.call-user-func-array]: First argument is expected to be a valid callback, 'theme_webform_mail_textfield' was given in C:\wamp\www\drupal-6.2\includes\theme.inc on line 591.
warning: call_user_func_array() [function.call-user-func-array]: First argument is expected to be a valid callback, 'theme_webform_mail_pagebreak' was given in C:\wamp\www\drupal-6.2\includes\theme.inc on line 591.
warning: mail() [function.mail]: SMTP server response: 501 5.5.4 Invalid Address in C:\wamp\www\drupal-6.2\includes\mail.inc on line 193.
Unable to send e-mail. Please contact the site admin, if the problem persists.
warning: mail() [function.mail]: SMTP server response: 501 5.5.4 Invalid Address in C:\wamp\www\drupal-6.2\includes\mail.inc on line 193.
Unable to send e-mail. Please contact the site admin, if the problem persists.

Desdejá agradeço!!!

Obrigada a todos