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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...
}
?>Submitted by Dominique De Cooman on Wed, 2009-04-29 21:50
