Drupal drupal_get_form() First argument is expected to be a valid callback and your sure the form exists

Posted by:

Dominique De Cooman

On:

Wednesday, April 29, 2009 - 22:50

This means drupal cannot find your callback to your form.
Possible causes:

1) Drupal cannot find your function because the php file containing the function is not loaded.

I had this problem when I tried to call the 'simplenews_subscription_list_add' form with.

<?php
drupal_get_form('simplenews_subscription_list_add');
?>

It failed giving this error:

warning: call_user_func_array() [function.call-user-func-array]: First argument is expected to be a valid callback, 'simplenews_subscription_list_add' was given in C:/wamp/www/bvl/includes/form.inc on line 366.

The solution: Look at the menu hook in the simple news module calling the fucntion.

<?php
  $items['admin/content/simplenews/users/import'] = array(
    'title' => 'Mass subscribe',
    'type' => MENU_LOCAL_TASK,
    'page callback' => 'drupal_get_form',
    'page arguments' => array('simplenews_subscription_list_add'),
    'access arguments' => array('administer simplenews subscriptions'),
    'file' => 'simplenews.admin.inc',
    'weight' => -9,
  );
?>

This means the form is inside a file called 'simplenews.admin.inc'. So you need to load the file:

<?php
module_load_include('inc', 'simplenews', 'simplenews.admin');
return drupal_get_form('simplenews_subscription_list_add');
?>

Now your form will be loaded.

2) You made a typo :)

<?php
//this will work
drupal_get_form('myform');

//this wont
drupal_get_form('my_form');

function myform() {
  //form defined here...
}
?>

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