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In Drupal 7, I'm getting this error and want to fix it:

  • Warning: array_merge() [function.array-merge]: Argument #1 is not an array in _form_set_class() (line 4021 of {my site}/includes/form.inc).
  • Warning: array_merge() [function.array-merge]: Argument #1 is not an array in _form_set_class() (line 4021 of {my site}/includes/form.inc).
  • Warning: implode() [function.implode]: Invalid arguments passed in theme_radios() (line 2746 of {my site}/includes/form.inc).

What does this mean, and what should I do about it?

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2
  • What you did do cause the error would be most helpful to know.
    – Letharion
    Commented Jan 23, 2012 at 8:05
  • I had the same problem, when I uninstalled the module Custom Breadcrumbs (7.x-1.x-dev) and reinstalled again, it was solved.
    – user5289
    Commented Jan 31, 2012 at 20:27

3 Answers 3

Reset to default
10

For me it happened; when I used

$form['field']['#attributes'] = array('class' => 'myclass');

While it should be

$form['field']['#attributes'] = array('class' => array('myclass'));

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1

There's likely a buggy FAPI definition. Are you developing a form? If so, check your form definition. It's not being returned as an array.

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0

So i figured it out, I wasn't sure what I had done to make this start happening, but it was being caused by the "Drupal for Facebook" module. It was only popping up when I was on a node edit page strangely. For those familiar, I had the "FB User Management" enabled and after disabling, it stopped giving me the error.

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