Undefined index: buttons in rules_forms_form_alter() (line 81 of */sites/all/modules/rules_forms/rules

Same here, and a lot of notice errors as well when you clear the form elements to and build it again.

I have the same issue, but different piece of code

Notice: Undefined index: buttons in rules_forms_rules_event_info() (line 40 of C:\www\imsa\sites\all\modules\rules_forms\rules_forms.rules.inc).

please help.

Try changing line 40 from:

if ($info['buttons'] && isset($info['submit'])) {

to:

if (isset($info['buttons']) && isset($info['submit'])) {

Try dev from the fork.

I've tried to reproduce this issue with both latest stable (7.x-1.0 as of now) and 7.x-1.x and I couldn't - it just works.

It seems the issue would be generated by not having a buttons index as returned by rules_forms_get_form_info(). Values are actually stored in the rules_forms_form_info variable, which is populated at rules_forms_activate_confirm_form_submit() as follows:

  $form_info = array(
    'label' => $form_state['values']['form_id_label'],
    'elements' => array(),
    'path' => $path,
    'buttons' => $form_state['values']['button_validate_submit'] == TRUE,
  );

I can't see how this would leave buttons unset anymore, so I think this has been solved already.

Marking as needs review.

Thanks erickbj for your input and analysis. With this, I'm closing this issue, since this appears to be fixed.