Drupal: Form api custom validation function doesn't work

Drupal: Form api custom validation function doesn't work

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Drupal: altering form with hook_form_FORM_ID_Alter
Drupal: altering form with hook_form_FORM_ID_Alter
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Exception #0 (Exception): Notice: Undefined index: id in Iterator.php on line 63

Exception #0 (Exception): Notice: Undefined index: id in Iterator.php on line 63