Node creation error when used with HS

1) You're using the latest development snapshot?
2) The module that is providing that form should do this:

Hierarchical Select compatibility: gotcha's
-------------------------------------------
- "Invalid response from server"
  This typically means that some functions could not be found when
  Hierarchical Select does an AHAH callback to the server, which in turn means
  that some code (some PHP file) has not been included, while it should have
  been.
  Hierarchical Select supports the same system to define files that should be
  included as CTools:
    $form_state['form_load_files']
  Hence you should do something like this in your form code:
    $form_state['form_load_files'] = array(drupal_get_path('module', 'node') . '/pages.inc');
  Which could look like this in your case:
    $form_state['form_load_files'] = array(drupal_get_path('module', 'mymodule') . '/something.inc');

(see API.txt)

Which module is providing that form?

*That* module should apply those guidelines. Drupal 7 will require something similar, so it's not such a strange demand: http://api.drupal.org/api/drupal/includes--form.inc/function/form_load_i...

Then let's move this to its issue queue.

Mhm. The form function is just $type_node_form here. We just pipe the output through an additional page callback. Or are you using plupload dre788?

Okay, I don't really understand this yet. I'll need to rebuild the situation. You have a content taxonomy field on the image type of node gallery and use the Hierarchical select widget on that?

Perhaps its enough to change the module_load_include to a corresponding call to form_load_include() in the upload page, but I'm unfortunately really constrained on time right now, so I can't try it out.

dre788: please try the latest development snapshot.

Wim Leers probably meant the latest snapshot of Hierarchical Select, because there was a change in the related code, see #697172: "Invalid Response from Server", possible causes and solution
Or did you try that?

I was able to reproduce, and tried quite a few solutions, none of which worked. I did use the latest dev of HS, and I tried including node.pages.inc as recommended using FAPI.

I'm pretty sure that #538022: JS alert: "Received an invalid response from the server." needs to be resolved before we can fix this - I did not apply any patches from that issue due to time.

Marking postponed until the issue above is resolved. Once that's done, simply adding a

    $form_state['form_load_files'] = array(drupal_get_path('module', 'node') . '/node.pages.inc');

to node_gallery_form_alter() and changing the signature to pass $form_state by reference should fix it. I didn't commit this code because I'm not 100% sure it's the fix.

Once the issue above is resolved, feel free to set this issue to active.

Issue queue cleanup.